Ha, Ha, Ha. Class action lawsuit. Really? IF you want to go that route you had better be ready for your life to be turned upside down. Have you ever taken a long break. not done some aspect of your job, come in late, left early, been written up etc. If so they will bring this up on everyone who may have done this and also they will look into your personal life, your social media post and also they will track you down on any and all searches you have done. And not just you but anyone else who may want to go this route.
Also, you have to have a boat load of people to file a class action and in the end even if you will 10 million dollars, after legal fees and any appeals and the split between the numerous plaintiffs you may walk away with $2.50 cents.
Just look at any class action suit, unless you are a primary plaintiff you get very little.