Welcome to BYC. I'm afraid I can't help with that. I don't have any auto doors. My coops are open to secure runs 24/7 so I only open doors when I am out with them.
You won't regret it. They are beautiful, more intelligent than most chickens, and most are friendly. I only have one hen left, LeeLoo, but she is a favorite. Its hard to find them anymore. I think most people pass them over, in favor of austrolorps, because langshans are not the best layers.
Welcome! I am sorry that happened!
BYC has members all over the world.
There are many fb chicken groups & I'm sure there is one near you. Please ask plenty of questions of anyone you rehome them to. Good luck!
Welcome to BYC, Jesme! I adore langshans. One of my very first hens was a langshan. She has passed on but I always called her the matriarch because she raised most of my flock.
Welcome to BYC. I would not. It is too small and is not sturdy or secure. They wood will rot quickly and the roof will probably leak. A determined predator could break into that pretty easily.