Drinking, selling, manufacturing and serving Khamr is Haram (prohibited) for the server helps the drinker in sin and transgression. Allah (Exalted be He) says,
Help you one another in Al-Birr and At-Taqwâ (virtue, righteousness and piety); but do not help one another in sin and transgression.
Therefore, it is not permissible to stay in this job, as means of lawful earnings are numerous. Allah (Glorified and Exalted be He) says,
And whosoever fears Allâh 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.
May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.