Just get a long stick. Shake the goodies can to get their attention and pour a bit of goodies in the door of the yard that you want them to go into. Let them out, and then just stand with them between you and the gate. This is a case of slower is faster. Just tap the ground, and say "Hut, hut" when the birds moved away you, hold still. When the birds stop moving, just take a step toward them tapping the ground, moving slow, when they start to move you stop. It is called pressuring, and you want to apply just enough pressure to get them to move, but not panic.
If one bird tries to go the wrong way, just tap the ground in front of them, if one gets by you, just leave them, just keep working on the main flock. Once the flock is in the yard, eating the grain, go back out and get the straggler, who will head directly to the coop.
Just make sure that to move away from you, makes them move in the direction you want to go, and to move slow. I can move my flock quite a distance in a pretty short amount of time.
