You need a "cheater bar", a long tube or pipe that you put over the handle of the wrench to extend it, giving you more leverage. Be careful, or you will just break your wrench this way.. . Next time your tires are put on in a shop, make them write on the work order your request to not tighten the nuts to where it takes power tools to loosen them. Test it (no need to have the car up on the lift, just try to loosen the lug nuts) before you leave the shop, and if they didn't do it right, make them do it over.. . Then find a new shop. If the nuts are put on that tight, these guys are morons who are destroying the nuts and bolts.