If I sold alcohol to a minor while working at a convenience store, what do I do?

You need to know up front that Florida imposes tough penalties on businesses and individuals who violate the law against sale to minors. A first-time violation could mean jail time for an individual or could cause a business to lose its license.  You need to tell your boss that you made a mistake and give him or her the chance to speak with someone before it could become a huge problem.  It may not be fatal here as it depends on what results from it and if the matter comes to light.  I am not stating that it should be concealed.  On the contrary.  It needs to be out in the open between you, your boss and his attorney at this point in time.  Do not live with this.  It could explode in your face.  Good luck.

If you were still training at a convenience store, and your supervisor forgot to card someone, and you forgot, then you need to realize that your supervisor should have caught it and carded that person before leaving the store. How do you know that person was a minor simply by forgetting to card the person? Did you lose your job because of it; if so, there is not much you can do about it. You may be charged with selling alcohol to a minor but if you have already been charged, you should consider talking to legal counsel about what occurred and see if there is surveillance footage showing your supervisor who should have been watching over your training.