Work in Germany
Okay, this clears up a lot of information. In all honesty your best bet would be something in the service industry, wait-staff is really needed pretty much anywhere. Of course that is also hard work with bad hours, but most likely your best bet when it comes to student jobs. Depending on what type of restaurant/pub you'll end up working with, not knowing German might be okay. Not sure if the supermarkets are really looking for people just looking for a side job (I am assuming you want to do this while going to university as well) but always worth asking, lot's of places a have hard time fining any people right now.
All in all I wouldn't really worry too much about finding something non-tech in the tech industry. Tech companies tend to no longer have any non-tech jobs since all that stuff is outsourced and there's really no benefit to it in my opinion.
One thing you could look at is a traditional 'Ausbildung' in combination with the 'Berufsschule'. Though if you are set for going to university that's most likely not your thing. But it might be a good way to get an IT related job-training (which tends to be fairly well paid) and a step into the IT world. (Or some other tech related jobs) If you are into IT I do know a pretty good company that does the Fachinformatiker-Ausbildung in your area, though you will need to know more than just basic German for that.
If you are serious about photography you could also try and find photographers that offer the Ausbildung. Might be harder to find as it's not a field that's quite so sought after, but might also be a good step.
In my opinion it's an often overlooked possibility to get real work experience, job-training with an official degree and often also the chance to directly start with the company that does the training to get a full-time job after you are done. I did that myself and it paid off very well.
While I don't actually live that far away from Frankfurt it's still too far to know of any local places that might offer a job. But you should really check out the Berufsausbildung and see if there's something there for you.

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