If I let them free range I wont feed them til I want them back in. They come running when they see the bucket. Maybe something like that ? A special colored bucket with a special treat . They will learn what it means.
They are inclosed in a run but I always put them up at night in the coop. They like any bucket lol I don't free range unless I'm out there because of the neighbors dogs. They are just grumpy at night.