They will go out. They are quite young yet. It may take more than a week. Chickens get frightened so easily, a good instinct to protect from predators. Just let them choose their own time. Curiosity will win out in the end.
Mine are 12 weeks and still spend a lot of the day in the coop, although I give treats in the yard, and they all come piling out when I arrive. They peck around the yard early morning and late in the day, but tend to stay in during the middle of the day, I suppose for the shade.