Pop door. People door. Nesting box door. On our current coop, each has a different type hardware. We're building a new coop and I'm wondering what others have used and feel is most secure. The one system I am happy with is a swivel hasp lock on the nesting box door. We hook a carabiner into the hole on the swivel so that it won't open even if the swivel is turned. You'd also have to open the carabiner to gain entrance. It's works well and allows for fast access but I'm wondering if it's totally predator proof. Could a raccoon get lucky if he worked on it long enough? One door has a sliding bolt latch. Another door has a self-locking gate latch - the type where you slam the door and a little hook of metal comes down and secures the bar. Both of these give me problems if it's been raining, guess the wood swells. I see pictures of doors with padlocks. I don't want to go there as I'm envisioning lost key's or forgotten combinations and not being able to open it. So, what works best and is most secure without doing padlocks? I'm only concerned about keeping predators out, not people.