Short answer: A key that snaps in the cylinder or a deadbolt that suddenly fights you is one of the most common calls we handle in Mountain View. Here is what is really going on inside the lock, how a pro gets you back in without destroying the hardware, and when a quick fix beats a full replacement.
A key that snaps in the cylinder or a deadbolt that suddenly fights you is one of the most common calls we handle in Mountain View. Here is what is really going on inside the lock, how a pro gets you back in without destroying the hardware, and when a quick fix beats a full replacement.
Most broken-key calls are not bad luck — they are the end of a slow decline. Brass keys wear a little every time you use them, so an original that was cut years ago gets progressively thinner while its copies of copies drift further off the factory spec. When a worn key meets a dry or gritty cylinder, you instinctively force it, and the metal fatigues right at the shoulder where it enters the plug. Locks seize for related reasons: dust and pocket lint pack into the keyway, the internal springs weaken, or an exterior deadbolt swells and binds after Bay Area winter damp and summer heat cycles. A telltale sign you are heading for a break is a key that only turns if you jiggle, lift, or pull the door toward you first — that is the mechanism warning you, and it is far cheaper to service it then than after the key shears off inside.
The wrong move is to jam something in and push — that only drives the fragment deeper and can score the wafers or pins. A locksmith first reads the plug: is the broken piece flush, is the cylinder in the locked or unlocked rotation, and can the plug be turned back to the neutral position where the key would normally withdraw. From there we use thin spiral or hook-style extractor tools that grab the blade's cuts and walk the fragment out, sometimes working two tools from both sides of the keyway. Good lubrication (a dry PTFE or graphite-based product, never sticky household oil that attracts grit) usually comes next. Once the fragment is out we test the cylinder with a fresh cut key and inspect for internal damage. A straightforward extraction is typically in the range of $75 to $150 depending on the lock type and how the piece is lodged, but that number climbs if the cylinder itself was damaged and has to come apart.
Not every broken key means a new lock. If the cylinder is healthy and only the key failed, cutting a clean new key from the lock's code (or from a good remaining original) solves it for the cost of a key and a little labor. If the lock is worn, sticky, or you have simply lost track of who has copies, rekeying is the middle option — the locksmith re-pins the existing cylinder to a brand-new key, so old keys stop working while your existing hardware and finish stay in place. Full replacement makes sense when the lock body is corroded, the deadbolt no longer throws fully into the strike, or you want to upgrade to a higher-grade or smart lock. A trustworthy pro will show you the failed part and explain why they are recommending one path over another, rather than defaulting to the most expensive option.
Most broken-key calls are not bad luck — they are the end of a slow decline. Brass keys wear a little every time you use them, so an original that was cut years ago gets progressively thinner while its copies of copies drift further off the factory spec. When a worn key meets a dry or gritty cylinder, you instinctively force it, and the metal fatigues right at the shoulder where it enters the plug. Locks seize for related reasons: dust and pocket lint pack into the keyway, the internal springs weaken, or an exterior deadbolt swells and binds after Bay Area winter damp and summer heat cycles. A telltale sign you are heading for a break is a key that only turns if you jiggle, lift, or pull the door toward you first — that is the mechanism warning you, and it is far cheaper to service it then than after the key shears off inside.
The wrong move is to jam something in and push — that only drives the fragment deeper and can score the wafers or pins. A locksmith first reads the plug: is the broken piece flush, is the cylinder in the locked or unlocked rotation, and can the plug be turned back to the neutral position where the key would normally withdraw. From there we use thin spiral or hook-style extractor tools that grab the blade's cuts and walk the fragment out, sometimes working two tools from both sides of the keyway. Good lubrication (a dry PTFE or graphite-based product, never sticky household oil that attracts grit) usually comes next. Once the fragment is out we test the cylinder with a fresh cut key and inspect for internal damage. A straightforward extraction is typically in the range of $75 to $150 depending on the lock type and how the piece is lodged, but that number climbs if the cylinder itself was damaged and has to come apart.
Not every broken key means a new lock. If the cylinder is healthy and only the key failed, cutting a clean new key from the lock's code (or from a good remaining original) solves it for the cost of a key and a little labor. If the lock is worn, sticky, or you have simply lost track of who has copies, rekeying is the middle option — the locksmith re-pins the existing cylinder to a brand-new key, so old keys stop working while your existing hardware and finish stay in place. Full replacement makes sense when the lock body is corroded, the deadbolt no longer throws fully into the strike, or you want to upgrade to a higher-grade or smart lock. A trustworthy pro will show you the failed part and explain why they are recommending one path over another, rather than defaulting to the most expensive option.
Call (650) 564-3488 and describe the situation, your exact location, and what you need. Timing is confirmed on that call rather than promised in advance.
Call for help: (650) 564-3488 — a straight answer and an honest estimate before any work begins.