Any employer who is found by a court of competent jurisdiction to have paid an employee wages less than those to which such employee is entitled, under or by virtue of this act, shall be liable to such employee for double the full amount of such wages, less any amount actually paid to such employee by the employer, and for court costs, and such reasonable attorney fees as may be allowed by the court, which in no case shall be less than One Hundred Dollars ($100.00). Any agreement between such employee and the employer to work for less than such wage rate shall be no defense to such action.