I need to write a door writing that states formally, "students are not welcomed in this kitchen, please use the café..."
I've drafted some examples but I was wondering if there is a formal sentence which may sound more formal (like a warning from the principal) and also more native.
z.B. "staff only"
"Students are not allowed"
"We kindly request students to use the ... Cafe provided." or What about ""We kindly request students to use the other areas(opportunities) provided for the tea service."