What do you mean no entry?

People who don't do things don't come in.

Idle people are not allowed in, which usually means that the workplace is often influenced by business unrelated to work, and reminders are issued to remind people who don't need it there that they can do something, but please find out whether it is done here, and people who have nothing to do don't bother the office.

Idle people are not allowed to enter, idle people are not allowed to enter and idle people are not allowed to enter. Generally, signs or notices will be made, posted or hung in some places to remind irrelevant personnel not to enter.

Euphemism:

In many offices, signs of "No Entry for Idle People" are posted on the doors, which makes the audience suspicious of "Idle People" and very uncomfortable. Translated into English, literal translation can probably be translated into no entry for idle people, etc., which undoubtedly confirms foreigners' conjecture that China people are "bossy", which is obviously inappropriate. Later, the tone of some units eased a lot, and the signboard became "no entry for non-official business", which translated into English as "no entry for non-official business", and the tone also eased a lot.

In fact, this kind of "no admittance for idle people" and "no admittance for non-public" is not unique to China. It's just that most foreigners use "... only", which means "... for exclusive use only". For example, "employee only" means that only employees can use/enter, which means the same as "no admittance for idle people", but it feels much better in tone.