I am a salary worker and i am told to show only 10 hours worked no matter how many I work?

If you are salaried, why are you required to clock in/out?  Maybe you are misclassified as a salaried employee.  This is very common.  If you are properly classified as exempt (salaried) then it doesn't matter how many hours you work.  Perhaps your employer suspects you are misclassified and is trying to avoid a wage/hour problem.  You should consider consulting with an employment attorney to determine whether you are properly an exempt or non-exepmt (from overtime rules) employee.