Does the ancient door lock look simple and firm?

In film and television dramas, we often see ancient locks in China, and intuitively feel that these locks are very simple, as if a wooden stick can pry them open. So, in the case of non-violent destruction, how safe is the ancient lock in China?

This requires the structural analysis of traditional locks in China. Taking the Ming and Qing Dynasties, when traditional locks were relatively mature, as an example, according to the different structural principles, traditional locks in China can be roughly divided into three categories: wooden locks, coded locks and reed locks.

Wooden lock is a variant of latch, which is often used to lock doors. Its principle is similar to the marble lock in the west.

A latch is a crossbar placed on a door. People close doors and windows by moving bars. But the latch can only be operated on the inside of the door, and people can't lock the door when they go out, so the ancient people in China invented the wooden lock. Wood, how can it be strong?