lilgto64 seems to misunderstand the actual operating hours of the Paris Opera Apple Store. According to the Apple web site, they are open M-W 9 am to 8 pm, Th-Sa 9-9, and closed on Sundays.
The 9 pm to 6 am stretch is night shift work under French law. So, if on Thursdays, everyone goes home at 9, none of your day shift workers are working during the night hours. And, if everyone goes home on Tuesdays one hour after the store closes, again no problem.
By his thought, yeah, the store could have people come in at 7 am to prep the store for those 9 am shoppers.
My understanding is that under French law, you can have day shift people work during night shift hours under exceptional circumstances. It has to be something unusual, not "we need to get the store tidy for tomorrow."
I also hadn't realized the store already closes at 8pm. That goes along with my earlier comment. I think an hour of clean up and preparation in the evening shouldn't be an issue.
I do wonder how horrible it must be to live in a country where things aren't commonly open at night. Can you leave work at 9pm and still get to a pharmacy or grocery store?