What is the general income of supermarket employees in Shanghai?

The salary of supermarkets in Shanghai is only 3,000 yuan, including overtime, working 12 hours a day, with subsidies and overtime pay on holidays, which is about 3,500 yuan a month. Because this kind of position has no technical content, the employment demand is relatively large, and it is easy to find a job, that is, the working hours are long, so I hope to adopt it.