After many years of working in the field, I have to say repeatedly, people believe they have so many more rights than they do, until it happens to them. They will yell "Get a job!" to the homeless, thinking THEY will never find themselves without, and then suddenly, zap, simply because we were in the mood. "Great injustice" the employer does not give a quarter of a care to, or whether your family can eat or not.
Your only recourse in this situation is to file immediately for unemployment insurance. If the employer has not fired you for a gross misconduct reason (something so bad you should've known it was absolutely wrong in the first place, like say for instance grabbing the 18 year old's person in some inappropriate way) then they have to show that they told you what you did was wrong, and that you were given warnings and chose to continue the behavior and thus give them a valid misconduct reason to terminate you, then you will be likely to qualify for unemployment insurance while looking for another job.
This is not much money, and it ends very sharply after about a maximum of six months, whether you are re employed or not. But it does provide a tiny stipend paid in by the employer to cover the employee and give them something if the employer has decided to fire them undeservedly. It is not income based and not needs based. It does require a covering of the events, and the employer will have to think long and hard about why exactly they decided to terminate you and what they might tell future prospective employers about your reasons for leaving.
You file a claim for benefits. You tell your story of what happened. You stress that you always did your job to the best of your abilities, you did NOT sexually harass anyone, and you had no idea that you were about to be terminated due to your workplace behavior. Then the unemployment system will contact the employer. What they say is weighed and what you say is weighed, with the assumption that one or both parties may be lying. They go with the story of who is more believable on whether or not to approve or deny benefits initially. Then, either you or the employer will have a chance to appeal the decision with a hearing (if you draw benefits, it costs the employer money, so they're usually not willing to simply give you the chance to draw them) But in some cases where someone is let go in this sort of situation, they do not even choose to fight against your approval, and all you have to do is deny any wrongdoing.
If they have video or witnesses of you doing something very inappropriate, or a pattern or reprimanding you for similar behaviors in the past, you're not so likely to be approved. It all depends. But it does give you a chance to work out the issues, see and discuss any proofs or documentation the employer may use, etc. And if approved, it would give you so much a week for so many weeks, in money, until your next job. Otherwise, they can and they have done what they did to you.
I would strongly strongly suggest that you not spend any time whatsoever discussing the reasons you were terminated with the next prospective employers you deal with, not mention the injustice of the whole situation, because all employers know good and well that if they want to, they can.