And keep it in a safe place. But if you still need inspiration to back it up, and the inevitable has happened, here's what you can do. The standard key used by the automotive industry is the mechanical key, which you insert into the ignition cylinder and turn to start the car. If you lose it, you could call a car locksmith, who can come and make you a new key on the spot. In the case of an older vehicle, the locksmith may need help to help you. You may need a new cylinder and key from your dealer or repair shop.