I am a new chicken owner but decided chickens can be conditioned like any other animal. As soon as my pullets moved from the mudroom at night into their outdoor night home (the run under the coop till the coop is done) I would ring a bell when it was time for them to get moved from their contained pen in the yard to the locked up run, say "treats" and "coop" and sprinkle a little bit of cracked corn for them to enjoy once they were inside. It only took one or two days for all of them to run from their outdoor pen to the coop after I started doing this (versus getting caught and carried). I have been letting them free range since they were 9 weeks old and now when I ring the bell they all first run to me and then head with me to their night home. I also do this if for some reason I lock them up during the day; they all come very willingly. When the coop is done I will move the reward to inside the coop but they will still enter the same place they do now so they will be contained. I figured the bell would be good if someone other than myself needed to put them away, it would be a consistent cue.
I see that many suggest locking them in the coop for a few days to get them use to it. Along with that you might want to try a cue and a positive reinforcement for your nighttime ritual, it has worked great for my girls without having to lock them up in their new home for a few days.