Ask a Business Lawyer. Get Business Law Questions Answered ASAP.
Well, they still owe you the money.
You can start by filing a wage claim. You can do this for any unpaid wage. Do so here:
Since they are out of business, you might end up having to sue them in small claims to get the money.
If the entity was an LLC or Corp, just sue whomever you can name and locate. If there was a person that owned the entity, you might still be able to get paid.