How to approach a manager when asking for a job in person?

Just graduated high school, and I don’t wanna waste any more time in getting my first job. I’ve been applying online and stuff but I think we all know how hopeless trying to get hired through an online application can be... plus it takes too much time I feel with the application reviewing and consideration process and what not. But I’ve been avoiding having to go out and actually speak with store or restaurant managers due to my pretty janky social anxiety. I know everyones gotta start somewhere, but I can just use some advice I guess.

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