I'm brand new to chickens. 1-1/2 weeks ago I got my first two hens - 20 wk old white leghorns. We built a 2-story coop. Top floor has three nesting boxes and the perch. Bottom floor has the food, water and grass. The hens stay in the top floor all day. If I go jostle them out, they'll eat for five minutes and then go back up. I leave the door open so they can free range but they won't even leave the coop. No eggs yet. Should I just leave them alone?