A person so employed at less than the minimum wage provided by § 60-11-3 shall be entitled to recover the full amount measured by said minimum wage and costs, notwithstanding any agreement to work for less. Source: SL 1923, ch 309 , § 2; SDC 1939, § 17.0607; SL 1943, ch 76 ; SL 1945, ch 77 ; SL 1964, ch 67 ; SL 1966, ch 64 , § 5.