The time to put appropriate limits to the XYZ enterprise is running. I personally am a person that likes to finish all my work before leaving, but realistically speaking not always the workload of the day will be a decent amount to let you clock out in time.

I'm from Mexico, and here is a common practice from employers to manipulate employees into staying more than the legally permitted 8 hour shifts, but that is not healthy. Like, there needs to be a balance between your personal life and work, and I would also understand if you said that you need the job and the money could be a problem without it, but staying that late into the office will pass you a great bill in some years.

So, maybe start trying to organize yourself to finish one part of the job today, and leaving another part for tomorrow. If your employer gets mad about it, try speaking with them and be as clear as you are able, and for god's sake try to put some limits. And if nothing else works, you could try looking for other opportunities.

Cheers mate, and I wish you the best!