1. Get a milk crate, find a strong clothes hanger, force the arms of the hanger through holes in the sides of the crate, and force the hook through a hole in the top.
2. Put a screw in the wall. If your husband is watching, use a stud finder first. Hang the hook on the screw.
You now have somewhere in which to keep your best toy ever so your baby sister doesn’t get it. You can also keep things on top. This is not the sturdiest shelf in the world, obviously, but sometimes it’s the best you can frickin’ do right now.