Is there any nursing assistant jobs I can do when I'm only 16 and still in high school?

I'm going to be a senior in the fall then I am interested in becoming a Physician's Assistant. But until then I am looking for a job and I'd really like to start in the medical field. I would not be bothered by doing the unappealing jobs in a hospital like emptying pee buckets or whatever. Any ideas? I'm not looking to go to a school for this I have no experience

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