Keys break inside locks for two main reasons: the key is significantly worn or has a hairline crack from repeated use, or the lock itself is stiff and requires more force than the key can withstand. The break typically happens at the bow â where the blade meets the head â or at a thin cut point along the blade. If you have noticed that your key bends slightly when turning, that it requires increasing force to operate the lock or ignition, or that it catches when you try to remove it, those are warning signs of an impending break.
Memphis's climate plays a small but real role here. Locks on vehicles parked outside in extreme summer heat can expand slightly, making them temporarily tighter. In the rare winter ice events the area experiences, moisture in a lock can freeze and create unexpected resistance. If you feel unusual resistance, do not apply more force â withdraw the key and investigate the cause before continuing.
Stop. Do not attempt to start the vehicle, turn the ignition, or operate the lock further. If a piece of the key is still in the lock and you continue to operate the lock or ignition, you risk pushing the broken fragment deeper, rotating it to a position where it is harder to grip, or in an ignition, causing the wafers inside to lock around the fragment in a way that makes extraction far more complex.
If part of the key is protruding from the lock, you may be tempted to grip it with pliers and pull. Whether this is viable depends entirely on how much is protruding and whether the lock is in a neutral position. A smooth pull on a protruding fragment is often fine. Twisting with pliers is likely to snap the fragment further or score the inside of the lock cylinder, complicating extraction. When in doubt, leave it and call a professional.
Superglue is frequently suggested as a DIY extraction method â the idea being to glue a match or thin rod to the exposed fragment and pull it out. In practice, superglue is more likely to bond inside the lock cylinder than to the fragment, effectively gluing the broken piece in place permanently. This is one of the most common ways a simple extraction job becomes a cylinder replacement job.
Spiral notebook wire, bobby pins, and earrings are other common improvised tools that people attempt to use. These are not stiff enough to grip and move a metal key fragment, and they frequently break off themselves, adding a second obstruction inside the lock. Purpose-made broken key extractor tools, sold at some hardware stores, are a better option for someone who wants to try a DIY approach, but they require patience and a steady hand, and they are not effective in all situations.
An automotive locksmith uses a set of thin hooked or serrated extractor tools designed to slide alongside the broken key fragment and grip it from the side or end. The lock is first manipulated into a position that gives the extractor the best angle, and then the fragment is carefully drawn out. For most common vehicles and locks, this is a relatively quick process when done by someone with the right tools and experience.
Ignition extractions are sometimes more involved than door lock extractions, depending on the vehicle. Some ignition cylinders have a tighter barrel and less room to maneuver a tool. In cases where the fragment is deep or positioned unfavorably, the cylinder may need to be removed from the vehicle to allow better access. Ask the technician at the outset whether extraction can be attempted in place or whether cylinder removal is likely to be necessary, since that affects the scope and complexity of the job.
A successful extraction solves the immediate problem, but the underlying issues remain. The lock itself should be inspected for internal damage caused by the break or any extraction attempts. The lock should also be lubricated â a dry or corroded lock is often a contributing factor to a break in the first place. Ask the technician to inspect the cylinder and apply appropriate lubricant as part of the service.
You will also need a new key. If the broken key was your only copy, now is the time to have a new one cut and programmed properly. If you do have a spare, have a new primary key made anyway â do not rely on a single copy going forward. Memphis residents who commute across the metro, from suburbs like Cordova or Millington into the city, face long distances to deal with if they are ever left without a functional key.
Not every extraction attempt is successful, and not every cylinder is worth extracting from. If the cylinder was already worn or damaged before the break, or if previous DIY attempts have scored or distorted the interior, replacement may be the more practical path. A locksmith should be straightforward with you about this assessment after examining the situation â an honest evaluation should come before any work begins, not after a failed attempt.
If the broken key was in the ignition and the ignition cylinder needs to be replaced, the new cylinder will need to be keyed and potentially programmed to match your existing keys and security system. Ask whether the replacement will match your existing door locks so you retain a single-key setup, and ask whether your current programmed keys will work with the new cylinder. These details matter for your daily convenience and should be confirmed before the job is authorized.