then "workers" will want to go out on their newly-free Friday and have a coffee and some lunch with friends...and those workers better damn well be there to serve them!
What is it you think happens on Saturday? Do you think those baristas are working 7 days/week?
Ask a German or a Chilean how they spend their Sunday
It's not that everything closes, Malls open (Less hours) Chain Stores open and anything medium to large does, still, enough places close to make a difference, and also make the incentive of paying more to people working those days