The youtuber who posted this readily admits that it is made to be a privacy lock.
Locking the door with a fork.
It s the perfect method to quickly modify a door and make it more difficult for intruders to come in.
With a couple of small modifications you can use a simple dining fork to create a gadget that will lock a door that swings into your room.
The fork will be used as the lock itself although this diy project does require you to get your hands dirty at least for a little bit.