How can I ask a guy out in my early 20s?

I've asked a guy out in high school by walking up to him and tapping his shoulder and saying β€œI hav a crush on you.” I feel like there's a different approach to asking people out as an adult. How would I go about it? In what setting? (Grocery store, mall, resturant etc)
How can I ask a guy out in my early 20s?
How can I ask a guy out in my early 20s?
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