Decide your three questions first
Before the shift, not during it. Where things are, what the routine is, and who to ask when he is gone. Three, because that is what fits in the window you actually get.
Everything else can be worked out. Those three cannot, and the cost of not asking is standing in front of a till you cannot open with a customer waiting.
Repeat it back
So the fridge log is every two hours, in the book by the door. Ten seconds, and it is the difference between having been told and knowing.
It also gives him a chance to correct the version in your head while he is still standing there, which is the only moment that correction is cheap.
Saying you did not follow
On a first shift this feels like an admission you cannot afford. It is the opposite: the mistake that gets noticed is the one you made from guessing, not the question you asked in the first ten minutes.
Sorry, which button. This one? is short enough to say while holding something, which is the only kind of question that survives a real shift.
Then ask for a shift change
A separate and much harder conversation, and one most people avoid for months. It has its own scenario with the same manager.
Frank Delgado is warm pressure. He is not trying to catch you out, he is just busy, which is the version of difficulty that actually happens. The session is free and it runs eight minutes.
