If you work more than 40 hours, then your total week's earnings is divided by 40, and the overtime hours, wherever they occur are multiplied times the result of the division times 1.5 (or, times 2, dependent upon whether you are entitled to regular overtime or premium time). Labor Code § 510(a).
If you believe that you are being shorted wages, you can file a complaint with the DLSE at this link.
Once you file, if your employer retaliates, then you have an independent claim against the employer for the retaliation, which provides damages of lost wages and reinstatement. Labor Code § 98.6.
Hope this helps.
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