This is the first time I am posting, so hello out there!

I have the lever style door handles in my house. My 15 month has learned how to open doors a month or so ago. It wasn't so bad when she didn't realize what was in those closets (we blocked off other doors with gates), but I think I am in trouble now! Any ideas on how to prevent her opening the doors? I have only seen door knob protectors for round knobs, so I am at a loss! Any help would be appreciated.