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A door lock cylinder is a cylindrical tumbler that fits a matching key. Cars have at least two door lock cylinders (driver and passenger doors). Since they are used daily, they will eventually wear out and fail, requiring replacement.
Depending on the vehicle’s manufacturer, a new lock cylinder may have to be installed. This process may take more than a week. Avoid using the broken door lock, as it may damage the key and prevent the key from starting the car. If the key gets stuck in the lock, do not force it out. Breaking off the key inside the lock is a much bigger problem than just having a broken lock.
The door lock cylinder should be replaced as soon as possible if it malfunctions. A broken lock could trap or break the car key. A broken lock may also leave the vehicle susceptible to theft.