The door on my coop is horizontal (I can turn it into a normal swinging door), I can not make it vertical so the VSBb is out of the question. If I turn it into a normal swinging door then I need a sort of door latch that is on a timer so at the set time it retracts the latch at the set time and the door swings open. I hope someone can help. I have an out door power socket and solar would be ok too. Here is a sketch to help.