I had the same problem with my new chickens. I would take them out of their box, carry them in a cat carrier to the run/outside coop, and then let them out all day. I would put them back inside their box in the garden shed at night when the nights were still cool. When they got old enough to stay out in the coop at night, I kept them in their for a couple of days thinking they would get the hang of it when I let them out. The next night after I let them out, they all waited at the fence for me to put them in the cat carrier and take them away! So for a few nights I had to pick them up one by one and put them in the coop. It took about three nights until they realized that they should go into the coop themselves (even though they hung out there off and on all day!). Now they have it figured out and they go in there like clockwork every night!! It just took a little extra time until they figured out the new routine! Hope that helps!