Worked for a part time job

Resolve the issue with your employer.  You can do nothing else especially if there is proof that you worked somewhere else.

However, if you don't plan on coming back to Bahrain, just leave. He cannot stop you. Once you leave, get a lawyer to file for recovery of unpaid salary.  Your visa violation and unpaid salary are two different cases and not linked to each other.

I have a question related to the same post. Could you please tell me if there is any time frame for my employer to file a case against me ? He has the documents dated 4 months back.

I have found some papers related to this same company and they have been doing illegal documentation for employees as in copying our signature and making employment bonds which are not signed by us.

Can I use these documents and sue him or reverse blackmail him...?

This is so not me but I don't have any other option. This guy is making me work against my will.

Please advise @xtang

There is no time frame as you asked. If your ready to fight in court, have all the time and resources then go ahead and file a case else move on, this is my advise.