I did it for six months.
At first, it was good coz it fitted in nicely with my uni schedule and timetable (class during the day, free time, then work).
My co-workers adored me in that workplace so it made the whole thing less boring, other than that strenous liftings were bad for my lower back, the number of repetitions to put a tub of peanut butter on that damn shelf becamse so irritating, so I always had sore wrists and lower back. This of course affected my training on the next day.
My Supervisor was an asshole also.
I rated that particular job of my life: 3.5 stars out of 10. (mainly because of the ok pay).
Oh, one last thing, I HATED the fact that shoppers looked @ us as if they were more superior or some shit.
Once I took off my uniform I got my rights back again.