Think in the terms of them being babies and children. All they've ever known is the safety and source of their feed, the coop. Tossing them out before they're ready makes it harder for them to adjust, to be calm enough to realize that outside might be fun.
It took my keets a week or so before they climbed out of their coop door. And that's exactly where you would find them hours later unless something spooked them and they all piled back in. As time went by, about two weeks, I would see that the keets had moved around to the side of the coop. Still within easy hustling distance to get back inside to the safety they know.
Now a month and a half later they come up to visit the chicken coops, the garden, wander in to windrows, acting more like keets slowly becoming full grown Guineas.
Don't expect them to get it immediately, why should they? We let chicks have time to learn, why is it so important to shove keets out in to the world? They'll get there once they know its safe.