I have a large open run for my chicks who are around 10 weeks old now. I want to cut a door opening in the side of the fence that faces my pasture so when I cut the grass they can go eat grass hoppers, my problem is that some of them cant figure out how to get back in once their out. I either have to catch them or corral them to the door. what is the best way to do this? my old chickens I just shake a bucket of cracked corn and they come running. should I teach them that or is there a better method?