Murphy, you're facing the next big step in being a chick parent. Just as a kindergartner gets confused about what to do on the first day of school when it comes time to go back inside after recess, so do chicks not understand how going into the coop at night works.
On top of all that, have you ever stopped to think that the coop, even though chicks may be familiar with the inside, looks much different and alien viewing it from out in the run? That's why I install a small night light in the coop for the first week or so as the chicks are learning to go in at night.
The first step is to create a panic room out in the run so the chicks can learn to mingle with the adults and not be afraid of them. You can see pics and read how it all works by clicking on the second link below this post. After they are mingling with the adults and understand how to utilize their panic room through the numerous portals, then you move the chicks into the coop. I move their MHP inside with them so it's not too sudden a change. After one night, and I remove the MHP and place them on the roosting perch. It doesn't take them long and they're anxious to roost on any horizontal surface they can find in the coop.
The first night after they move into the coop, you may need to teach them to go inside. The night light may lure them inside without you needing to do anything, but some chick groups don't get it on their own. Please try to resist the urge to snatch them up as it's getting dark and stuffing them into the coop. It creates unnecessary stress for everyone.
Waiting until the adults have settled in and are roosting is easiest. Wait until you see your chicks congregating near the coop making their night time trilling noises, signalling their intent to huddle for sleep. Then, if they don't see the light in the coop and go inside on their own, climb inside and coax them in with a few meal worms. It may take doing this a second night, but they will have it down by the third.
And your work is done.