I work at costco, they can treat you like trash etc. punish you , nitpick and do what ever they want. just take it, you'll love the money, but you will get screwed over a lot, just dont let it phase you. Work, make money, go home. Thats it, dont involve yourself personally with co workers, dont look for dates etc. Just go there, work and go home.
My advice, been working there about a year.