Hi, I got my first 6 hens a couple weeks ago. They are 6-10 weeks old, and a variety of breeds. They've been in their coop with a heat lamp since I got them. I opened the coop because they seemed really interested in the outside world, and three of them came out. I live in Wisconsin, and it is only around 40 degrees today. Now, what is the best way to get them back into the coop, as they seem cold, but won't go back into the coop?