A simple drawer handle that is difficult for little hands to open.
Of course the kid will learn to open it eventually. Use it to avoid getting little clothing scattered all over the room; not to secure dangerous chemicals.
Attach it with a M4 bolt, large washer and nut.
Source: https://github.com/encukou/3d/tree/master/child-resistant-handle
The author marked this model as their own original creation.