Should I volunteer at 2 op shops?

I’m already volunteering at one and I overheard my boss mention the name of a very good man who runs two op shops in my local area. I’d like to get paid work in this field. Once I’ve been there a month, should I ask my boss if he wants extra volunteer workers and try to do 2 days at each store, for a reference and to try to get a job?

Should I volunteer at 2 op shops?
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