Can a raccoon or any other type predator undo this type snap if it's on the exterior door to my coop? If yes, then what type snap or lock should I use? I really don't want to use a keyed padlock because I know I will forever be making a second trip back into the people house to get the key for the chicken house. I suppose a combination padlock would work but I'd really like to find something besides a padlock if possible. Thanks!