A hundred percent fool-proof way to get hens to come in at night is
to
have a light that comes on at dusk and goes off at full dark.
I forgot to say that I built the Taj Mahen chicken door so it could be
automated with a photo cell actuating a small motor. The door is small
and slides up and down in the wall. Faced on the outside with metal.
Need Don or Roy to rig up a motor.