This^^^^Did you put them the coop to start with and let them figure out how to come down the ramp on their own?
No feed in their sleeping area----sprinkle feed down the ramp and give them time on their own to ease down it to eat might work.
I got SO lucky this year....only had to round them up one night..I was amazed and very happy. I hate playing the big bad 'Chick Chasing Monster'.It's taken mine just over a week to go to the coop at night. Feed and water are outside so they wandered down the ramp first day and now practically run down. Had to pick them up and place in coop for 8 days and last night, 9th day all but six went in on their own. Figure all will go in tonight. Little different each year but in general takes about a week for them to use the ramp to go back into coop for night.
I just go out and put them in by hand until they have more developed wings. The mama will show them how.My month old chicks have moved outside four days ago and are either too small or haven't figured out the ramp to get into the sleeping part if the coop. Does anyone know why or how to fix this?