Drawer Lock for children

My 1 year old son favourite game, is opening drawers, and closing his fingers inside them.
To prevent any harm, I designed these simple locks, which can be easily turned if you need to open the drawer.

I printed them with PLA at 60& infill, which is not very strong and easily break, so maybe I will put two for each drawer. Printing them in PETG or ABS will be for sure better, and if you do, please let me know the results =)

Stick them on the side of the drawer with some double side tape and that's it.