How to open the door without a key? What is the unlocking technique of the exterior gate locks?
Nowadays, people lose their keys for various reasons and cannot get in when they return home. They don't know how to open the door without a key. If they want to let the locksmith company open the lock, they feel that the lock cylinder is wasted. In fact, as long as you master the unlocking skills of some inner door lock, you can open the door even without a key, and you don't have to worry about having a key again.
