How to open the hidden lock on the door?

1 The way to unlock the hidden lock on the door is to lock it. Locking the door is often troublesome for many people, but it is the most economical and simple way to prevent theft. Generally, there are 9- 12 locking tongues in the upper, middle and lower directions of security doors. After locking, all the locking tongues will protrude into the locked state, which increases the difficulty of technical unlocking, prevents crowbars from prying the door, increases the difficulty of criminals in technical unlocking, prolongs the time of committing crimes and increases the probability of criminal behavior being discovered. So when you go out, you must remember to lock it outdoors and lock it indoors before going to bed at night. 2 reverse buckle. As long as the door lock is upside down. As long as the door lock is reversed, the technical unlocking will not open the door lock. Therefore, when there are people at home at night or during the day, the door should be locked on the basis of anti-locking, that is, the bolt under or next to the inner lock hole should be locked. Replace the door lock with high security level.