Not quite true, DOL will go to bat for you and fine the employer and get you paid. Violations of labor law are not simply small claims civil matters. Some employers get large fines.
The lawyers will though.
It looks like corporations make far more money stealing from workers than they'd ever lose in their dealings with the DOL. If enforcement were inevitable and fines high enough to actually hurt no company would ever dare steal from their employees, but because they do (and at such large scales) we know that they make more money from theft than they risk losing by stealing.