u/Impossible_Sky_2771

I am looking for a way to make the bathroom door lock toddler-safe. I want a way for adults to be able to lock it from the inside but not my toddler. I want my toddler to be able to open the door if he closes it, but not be able to lock himself inside. What do you all use? I am thinking a non-locking door-nob with a separate latch at the top of the door. Is there any easier way I'm not thinking of?