Whenever any person has failed to comply with a preliminary order of reinstatement, or a final order, including one approving a settlement agreement, issued under section 18C of the FLSA, the Secretary or a person on whose behalf the order was issued may file a civil action seeking enforcement of the order in the United States district court for the district in which the violation was found to have occurred. The Secretary also may file a civil action seeking enforcement of the order in the United States district court for the District of Columbia.