P.R.
Were you aware you had to wear fire retardant clothing when you took the job? Were you aware you would have to shower after work before you could leave the plant when you took the job?
A company only has to pay you for actual time worked, not time dressing for work or undressing when you are done working.
I realize this seems to be unfair.
If you are that unhappy have you considered looking for a job elsewhere?