I have a flock of 15 with 11 that are laying. They are 30 week old Americanas, Buff Orpington and Barred Rocks. However, I free range them and only 4 or 5 come back to the coop to lay. Unfortunately, we haven't been able to find where the others are laying I have customers wanting eggs and only being able to collect 4-5 daily I can't keep up with the demand. The girls have unrestricted access to about 3 acres of yard bordered on all sides by either soybean or corn fields. My questions is...can I keep the hens locked up in their coop for a few days-with water and food of course? Will this "train" them into laying in the coop or will they just revert back to their old habits when they are turned out again?