LO just turned one, isn't walking yet, but is fast becoming a pro at opening the lever handles in our apartment. All of our doors have lever handles, including the front door. So far LO's favorite is the bathroom, but he also has let himself out of our apartment a few times.

How does one baby proof these?

All the ones I have seen only work form one side of the door. I worry about getting locked in the bathroom with LO on the other side...

DH has to call when he gets home to get let in because I use the hotel lock to keep LO inside.