It’s five o’clock. On Saturdays, this is when my colleagues and I finish work. It is not therefore the ideal moment to wander into the shop. You’ve had all day, yet you’ve chosen the latest point possible.
And in an age where finding out opening hours is a click of a mouse away (not to mention the option of making a phone call) ignorance is not an excuse. Save your muttering for people who can tolerate your lack of timing – we have families we might actually want to get home to on a Saturday.