Can An Employer Be Sued For Paying Less Than N30k Minimum Wage?

Good evening nairalanders. I need an answer to the above question most preferably by the lawyers in this forum. Sometime ago, the President signed into law the new minimum wage of #30,000 but some employers especially private school owners still pay their staff as low as #10,000 monthly. Even here in calabar some weeks ago, the street sweepers were protesting for not being paid their '#7,500' salary for 6 months. My question is,
Does the #30,000 minimum wage apply only to government workers or are private employees suppose to adhere to this law also?
And in a case where you work in big Private school that makes up to 70 million in a term, can You sue your employer for paying less than the minimum wage without loosing your job or being fired?

source http://www.nairaland.com/6859573/employer-sued-paying-less-than