All you have to do is file a wage theft claim with the Labor Commissioner, who evaluates your claim and issue an ODA (Order Decision or Award). Once the ODA is filed it is considered a legal judgement against the employer. You can then use any legal means to collect.
Edit to add: the whole process so streamlined and employee friendly it happens entirely outside the court system. Once a claim is filed the employer has to pay you or appeal within 10 days.