In a class action lawsuit alleging that the compensation structure of defendant-school district violated state minimum wage laws, denial of plaintiff's writ of mandate challenging trial court decision that Labor Code's minimum wage provisions did not apply to defendant, is affirmed where: 1) adult education teachers fall within the professional exemption to Wage Order 4-2001; and 2) the salary structure did not violate Education Code section 45025, which requires proportional compensation for part-time employees.