This situation is definitely impossible now. You can put yourself in the other's shoes. What if you are the boss? Another restaurant is not a place for outsiders to enter. It is likely that there are recipes that outsiders don't want to know, or they are made in China, or even use inferior ingredients. What's more important is that you are short of waiters now. You want to learn something, and the boss wants to do a good job. You don't care if you don't learn. If you think there are a lot of waiters and the boss is deliberately looking for reasons, just take the retreat as the advance. On the grounds of resigning, it means that you can't learn anything and the salary is so low that you don't want to work. You can give it a try, but you should be prepared to resign. What if the boss approves?