Child safety medicine storage question?

We have to store our medicine in a closet. I use one of those Sterilite 3 drawer storage containers and it sits in the bottom of the closet. I put one of those door knob safety things on it so my son can't get into the closet. He is 2 and so far hasn't got it open, although he hasn't really tried. There is nothing he wants stored in that closet so he has no incentive to try to get in it.