Manga about meeting in a coffee shop/ cafe/ or any other family restaurants/ places.

Manga with a setting you requested:
Sorenari ni Shinken nandesu. by ASOU Kai - Uke works at a restaurant where he meets the seme.
Benriya-san by YAMATO Nase - Seme works at a Convenience agency.
Himegoto Asobi by SAKURAGI Yaya - Uke works at convenience store.
Dolce by KITAZAWA Kyou - Seme and Uke work at the same restaurant.
Kuimonodokoro Akira by YAMASHITA Tomoko - Seme and Uke work at the same restaurant.

Manga with a slightly different setting:
Koi made Hyakurin by AMAGAKURE Gido - Seme works at a flower shop.
Neon Sign Amber by OGERETSU Tanaka - Seme and Uke work at the same nightclub.
Dekiru Otoko no Sodatekata by YAMATO Nase - Seme and Uke work at the same restaurant. I am placing this here because they didn't meet there.
Mukuchi na Koi no Tsutaekata by YAMATO Nase - Side story of Dekiru Otoko no Sodatekata with another pairing.
Signal by HIDAKA Shoko - Uke works at a bar.

That's all I can think of right now. I hope at least some of them are to your liking! 😀

Thanks