I have 4 foot sections of white pvc I use as basically shepherds crooks to herd chickens. White is very visible to them. Move slow and don't rush them.
I have a white plastic kids hockey stick that are used to her chickens. I've never hit any of them with it but all I have to do is pick it up and walk towards them and they all march to the coop. If I don't have it it takes a little bit more work to get them headed in the right direction and stay that way.
I almost lost a baby chicken today. I went out after dark to make sure the chicken door was closed and Heard a chicken screeching. Somehow she had jumped up onto the window hinge and it closed on her. So she was sandwiched in there and couldn't get out. Scared me to death! I got her out and I think she's fine. I'm so glad I went out there to check.