 Pick one room that you would have to have this lock on so you could just shut it down, no congrain access to it, what would it be? My basement. My basement because I don't want the baby to be able to grab that door handle, go downstairs, we'll probably keep our cleaning supplies down there so the baby can't access. I would lock my gym. My kids love to go in and out of there and it's just really not safe with all the different weights and things around. They like to pull on things and work out so I think I'd lock that right away.