I have 6 chickens that free range during the day and always put themselves to be at night. Their coop is in a shed and the entrance, until recently has been a regular door that I open in the morning and close at night. My husband has recently made an automatic door that opens in the morning and then closes 30 minutes after sunset, by which time they are usually all well and truly in the coop. Since he installed the door two days ago (and the door is more chicken sized, about 2 feet wide and 3 feet high), they won't go inside at night! They just sit up on the fence, so the door then locks and they are stuck outside. I have had to physically put them inside and they DO NOT like being handled. The flap and squawk and I don't want to stress them out, but I also don't want them to get eaten. Do I need to retrain them by not letting them out for a couple days? They are about 5 months old. I just can't think why they now won't go in the smaller door and there is no point having an automatic door if they don't use it!!