My eldest has a 2-year-old corn snake that has learned to open her (maybe his) own cage! She bumps the latch to turn it and eventually gets it open. Sophie the cat found her under her cage table one morning, so we had to come up with a way to lock it down, but still get it open relatively easy. We used a shoelace.

We ran the shoe lace so that we can open it without unlacing it. When it is closed, we tie it with a bow. So far the cats have not been able to get on top of the cage, so the bow should be secure for awhile. Clever snek.