If you believe you can prove that your termination for being late for work was motivated by your race, I suggest discussing the details of your situation with a plaintiff-side employment lawyer and evaluating how to proceed based upon the advice of your lawyer. Even if we take you at your word that other employees weren't written up, suspended or fired for tardiness, we don't know enough about your situation to assess whether your employer's more rigid application of its rules to you was justified by the full facts or was discriminatory. For example, if you are supposed to be on the job to open up or to greet customers at the moment the business unlocks its doors, the fact that other employees are allowed to be late may have to do with the fact that their job duties are different and their lateness doesn't harm the business.