About Us There are several ways to cut car keys. Car key cutting can be done with the use of an existing key, or it can be cut by code. The fastest way of car key cutting is to simply duplicate the key by using an existing key. The slowest method will be to decode the ignition cylinder. With no complications, this will only take minutes. If the key cutting is requested after the locksmith has arrived to service the vehicle, then they may need to find the appropriate key blank. With that being said, a professional locksmith with experience will be able to do such a task very quickly.