If the jobs assigned to you in the restaurant includes selling pork, then as per the Shariah this job is haram and unlawful, but the entire salary will not be regarded unlawful. Alos, it is sin to own such type of restaurant. If you have any alternative lawful job, you should immediately leave this job, otherwise once you manage to get a satisfactory job you should leave it altogether.
Allah (Subhana Wa Ta’ala) knows Best
Darul Uloom Deoband