Instead of chasing them down, what you can try is to wait til it's just about dark (so you can see, but they have a hard time). You can collect them up a lot easier that way, since they won't try to run blind. Hopefully after a few days of doing that and you putting them in yourself, they'll get the hint. I've taught my new chicks (7 weeks old) to go in on their own. They were raised in the house for about 6 weeks, so they'd come to the front of the house and wait to be let in here, so I had to teach them where their new home was. After a couple days, they've gone in there every night without fail on their own. You can try the night light method in the coop as well til they go in and settle on their own while enough light is still in the sky.
Good luck,
Laura