Yah, if you had locked them inside the coop for about a week before you let them out into the run, they'd "get" it into their little heads that inside the coop is "home" and safe and where they need to be at night. You could still do that, if you want to imprint them with that knowledge now.
It's an exercise (literally!) to chase chicks INTO a coop before they're ready. Wait until they settle down at dusk, then pick them up and carry them inside. After 3 days of that, they generally go in by themselves at dusk.
Another way to get them into the coop - again, near dusk, otherwise it's just gonna get sweaty and tiresome to chase 'em - is to call 'em and toss some treats inside through the pop door. This is less successful than the above method, but it works for some folks.
Develop a chicken call, that you use when you want them to gather. Use it when you bring out treats for them. (Mine is silly, because I started it when I got my first chicks. I would step outside and say, "Chickens! I have CHICKENS!" every day, sometimes twice - once in the morning when I let them out of the coop, and once when I got home from work at night and gave 'em a treat. They learned to come for that call. I use it still, even though I'm sure my neighbors probably wonder when I'll get tired of announcing my chicken ownership to the world.)
