There are a few different reasons that car locks may malfunction. One common reason is if the car lock is frozen. This can happen if the car is parked outside in cold weather and the lock has been exposed to the elements. Another reason for a malfunctioning car lock is if the locking mechanism is dirty or jammed with debris. This can happen over time as the lock is used, and dirt and grime can build up inside the mechanism. If the problem is with the electronic locking system, it could be due to a dead battery or a faulty connection.