There are several potential causes for a key to break in a lock. First, the key may have lost some of its strength over time, making it more prone to break when turned, especially if done with too much effort. Alternately, it could be that the lock is broken or that debris has gotten stuck in its mechanism.
If a key breaks in a lock, there are a few things you can try to remove it
Use pliers or tweezers: If a portion of the key is sticking out of the lock, try using pliers or tweezers to gently pull it out. Be careful not to apply too much force as this could cause the broken piece to get stuck even further.
Lubricate the lock: Sometimes a key can get stuck in a lock due to friction or lack of lubrication. Try spraying a lubricant such as WD-40 into the lock and gently jiggling the key to see if it can be removed.
Use a broken key extractor tool: A broken key extractor tool is a small tool that is designed to grip the broken piece of the key and allow you to pull it out. You can purchase one of these tools at a hardware store or locksmith.
Call a locksmith: If you’re unable to remove the broken key yourself, a locksmith can help. They have specialized tools and techniques that can safely remove the broken key without damaging the lock.
It’s important to be patient and avoid using excessive force when trying to remove a broken key. If you’re unable to remove it, don’t attempt to force the lock open as this could cause damage to the lock and make the situation worse.