Akanai Tobira's Chapter 4 "It's Lonely When You're Cold" starts off with a meeting in a shop and, if I'm not mistaken, one of the characters works part time there.
In Yachin Hanbun no Ibasho desu the main characters work in a store together and often it's included in their interactions, since they get to know each other because of it.
I think there are surely some more, but mainly it's about part time work and the store is not really something, thats completely integrated in the storyline. ^^;
________________ "It's like love is a bonus in your life. Even without it, I'm just fine. I don't feel like pointlessly searching for it. You don't have to make yourself unhappy." (Ookami Shoujo to Kuro Ouji)
"Why does it rain?" - "To create drama." (Drops (Andou Yuki))