@Farmer Connie, I agree with you to an extent, but then again each chicken owner is different. For instance, on my little homestead, I have feed and water automated (when needed) so that I can sleep in on occasion (it is nice once in a while not to have to wake up when the rooster crows), or take a short vacation without having to bother someone (who didn't take on the "chicken responsibility") to do the work for me.
However, I am also the one up and at the chickens every other day (when not out of town), bringing them their fermented feed 2x a day and letting them out/in in the mornings and evenings. My wife told me that if we have these animals, it's my responsibility to make sure they thrive, so that is how it is. Raising animals, no matter what kind, is a responsibility. And frankly, chickens aren't that much work compared to many others, but you do have to be attentive.
@Andy E 123, you may want to take her advice and lock them in the coop for a week without free-ranging them, then they will be much more apt to going back there.
If it were me, I would lock them up for about 5-7 days in the coop, then if they continue to have issue with coming back at night, start creating "danger" outside the coop when the sun goes down. Take a hose and spray in their direction to lead them back to the coop. Clank pie tins or pans together near them to make them move. Show them that "outside the coop at night" is a dangerous place. It's worked for me on a few that are stubborn and refuse to listen to reason. Then once those problem chickens are in the coop, leave them in there again for a few days. Just my opinion, may not be "PETA-approved" but it's better than them coming face to face with real danger.