I work For wal-mart down here in Florida and i have a question.When u work over your schelulded time.witch will put u over 40 hours a week can they make you return home early on the last day of the pay period?

IF they do not want to have to pay you overtime, yes. If you work, they would likely be legally obligateed to pay you overtime and maybe they cannot per internal policy.
ps. I am assuming you are an hourly worker