Work for a co our starting time is 7 to 330 but are told to come to our shop at 630 to be on a job site at 7 but not compensated for starting early

The wage and hour rules in pennsylvania and federal law are fairly specific about what is compensable work time.  Many employers have been found in violation of wage rules for off-the-clock work they receive from employees -- especially before and after end of "shift".  There may be a valid wage and hour claim here.  You should seek the advice of an attorney.