I want the sheep to use a different gate to access the hay field.
On the first day, I showed them the gate. After that, they had no problem finding that gate when they wanted to graze the hay field.
However, teaching them to use that gate to come back to the barn took three days.
In late afternoons, when they wanted to come back to the barn, they stood by the old gate (now closed) and cried.
Twice, with the help of a Border collie, I drove them through the new gate so they could get back to the barn.
Finally, on the third afternoon, I went to the barn and found this:
They figured it out.