Yes, I've done this my whole life and seen many (most?) others do it too. I've never even seen thought it's a bad idea, because the gas pump shut off has worked

Yes, I've done this my whole life and seen many (most?) others do it too. I've never even seen thought it's a bad idea, because the gas pump shut off has worked 100% of the time for me. Go to a gas station, start pumping, and lock it, then go inside the gas station to buy some snacks. When I come back outside, the gas is full and I can go on my way.