HighIQ - At what fast-food restaurant is a customer expected to walk into the cooking area when they believe that their order is ready?

In your post you called walking into the cooking area of the fast-food restaurant "foolish,"
... are you able to articulate why you did it?
... did you realize at the time that it was foolish?

Have you considered that the employee may have called you out, not because you incorrectly thought they were done with your order, but rather because you violated their space by entering the cooking area?