If you inform the insurance company about losing the key, the claim may be accepted if the vehicle is later stolen. Spare keys can be a lifesaver when you lose your primary key. When you are away from home, pushing the car to a safe place is recommended until you have the spare key to open the vehicle. Using unauthorized keys can lead to a violation of the manufacturer’s warranty. Such keys can temporarily open the lock, but it is not recommended to use them. Ask for the help of an emergency locksmith if the situation asks for it.