Looking for advice on getting a second job and also no experience other than retail.

So, I’m really needing to get a second job because my full time one isn’t even enough. And I’ve been running into trouble because I already have a full shift and most places I’ve had an interview with are looking for unrealistic hours for me... I need to get a second job while studying classes too...so, do I tell interviewers that I have a job already and looking for a second one with limited availability ? Is that a good thing to do?

And also I don’t have experience in anything other than retail and am looking for a restaurant job for something different, any advice for that would be helpful to!

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