Agreed with the other answers. Hours worked are hours actually worked. There is a whole bunch of court cases that employers playing time sheet games does not make it true. Employees can keep their own time records and the employer's records are not inherently better (or worse) then the employee's records.

Past that:
- Federal statutory law (FLSA) says that the employer must pay at least federal minimum wage (on average over the workweek) for all hours worked. Federal law also says that a premium of at least 50% using Regular Rate of Pay must be paid for hours worked past 40 in the workweek. FLSA has a lot to say about just what is and is not "hours worked". FLSA however says nothing about base pay in excess of federal MW.
- State statutory law (if any) can raise MW, raise OT standards and cover base wages in excess of MW. State law cannot make federal law go away.
- Then there is a 1,000+ years of Common Law which basically says "a deal is a deal". Not employment specific law, and often overriden by statutory labor or contract law, but still very real law in many cases. Even states with no statutory labor law generally have Common Law remedies such as small claims court.