Hi! I keep seeing coop doors that slide up and down with the pull of a string.. some of them have an automatic timer to pull the door up when the sun comes up. I was thinking about putting one of these on one side of the coop. It would be inside the run which will be covered with hardware cloth.. top, bottom, and sides. I'm worried though if a racoon slipped inside somehow, would he/she be able to pull the door open? I know they are smart with locks. Can they open a small door that gets pulled up?