All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
Working in a bar is absolutely prohibited. Also, any support or help in this field is prohibited such as making visas, running after their residence visas etc.
You should know that if a person sees an evil, he should correct it with his own hands or with his tongue or at least with his heart and he should leave the place where evil is taking place.
Therefore, we advise you to look for a lawful job as much as you can which earnings are pure and free from any doubt and sin.
You should remember the Saying of Allah (which means): {And whosoever fears Allah and keeps his duty to Him, He will make a way for him to get out (from every difficulty). And He will provide him from (sources) he never could imagine}. [Quran 65:2-3]
Allah knows best.