In the US, gas stations are the corner shops outside of urban areas.

But in PA, even corner shops can't sell alcohol without the proper licenses. You've got to go to a specially licensed beer distributor or wine & spirits store. Grocery stores just recently were allowed and they're limited to beer and wine. A corner shop could get around this by providing seating and getting a license meant for restaurants to serve alcohol. Even then, hard liquor is only found at the state run wine and spirits stores.

At least that's my current understanding. It's stupidly convoluted so I probably got something wrong. I don't even know where breweries without seating fall into the mix.