Special circumstances can not be extended for 3 hours. You can apply for leave if you work overtime on Saturday and Sunday; Usually work overtime, here
Salary. This is partly reasonable and partly illegal.
Secondly, the unit has no corresponding regulations on the overtime system, and the principle needs to be negotiated with you. If you don't agree, no.
Can be forced.
Finally, there are two resignation procedures: one is probation, which can be oral or written for three days.
The second type: during the labor contract, you need to notify the unit to resign in writing 30 days in advance.
Third: If the unit forces you to work by force or violence, you can terminate the contract at any time.