Chilisweet, this is our current method of hurrying them back into the coop a little earlier (due to recent incidents with predators) than they'd otherwise choose: we turn their light on in the coop, like a beacon...it also gives them the extra light they need to keep laying as the days get shorter. I shake some wheat berries (or whatever treat is hard and rattles) in a container and call out our signature treat call: "Here, chicka chicka chicka," or whatever you can say loudly. Most of ours come flying and greedily start pecking away at the treat I add to their feeder...we currently have two stubborn hold-outs, which take a little longer to round up and convince to get in. If left to their own devices, ours will usually stay out until almost dark, but they hang around closer to the coop door.