(2) In addition to any judgment awarded to the plaintiff, the court shall allow reasonable attorney's fees to be taxed as costs in any judgment recovered.
(3) The action for the unpaid wages and liquidated damages may be maintained by one or more employees on behalf of themselves or other employees similarly situated.
(4) No agreement for compensation at a rate of less than the rate to which such employee is entitled under this article is a defense to any action under this article.