door opener

or door-opener

noun

a mechanism that automatically opens a door, as of a garage, when actuated by a radio transmitter, electric eye, or other device.
Informal. something that is effective in leading to opportunity or success:
Sales experience can be a door opener for young executives.

There was a sort of door-opener or verger at the entrance, and I said to him: "What is the meaning of all this?"

But a light had broken over the crass face of the elderly door-opener.

His habit of entering houses for this purpose, uninvited, earned him the nickname Θυρεπανοίκτης (“Door-opener”).

An Austrian officer is gaudier than the door-opener of a London cafe or the porter of a Paris hotel.

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