Hi there - I'm new to owning chickens myself (brought the flock home this past Sunday)!
The first night I couldn't get my hens to even glance at their coop (my setup is a 4 ft run attached to a coop). I had to physically place them inside the coop the first night, "coop" them in for the night, and stood around for about 5 minutes and they were still clucking around, seemingly unable to settle down. I've done this routine for the past couple of days: just before sundown, go out and spend a couple minutes with them in the run and then guide them to the coop, and just before sunrise, open the coop up for them to come on out. Right after I get home (or right when my wife gets home, which is typically before me) they are let out of their coop and into the run. This evening, they made it into the coop and started snoozing before I even went out to "tuck" them in! They are smart little suckers.