Janitor

The word janitor is related the Roman god Janus often portrayed with two faces, one in front and one in back, who is the guardian of doors and gates. Janus is also the patron deity of endings and beginnings; hence the month of January—a month of endings and beginnings.
 
The name Janus has its origins in Latin ianus (gate, arched passageway) and ianua (door, entrance, gate). Latin ianitor means a doorkeeper or porter.
 
The word janitor came to English in the 1580s meaning an usher in a school. By the 1620s, janitor also meant a doorkeeper.
 
Janitor, meaning the caretaker of a building or a man employed to see that rooms are kept clean and in order, is from 1708. A woman janitor was known as a janitress (1806) or janitrix (1818).
 
The word custodian, first seen in 1944 in American English, has gradually replaced the use of the word janitor.
 
Custodian is the short form of custodian-janitor, a term from 1899. The word custodian first came to English in 1781 meaning a person who has the care or custody of any person, place, or thing. The custodian is most often the person with the keys to a building and the one who controls access in the ‘off-hours’.
 
Custodian is a neutral term. There is no need to say custodianress or custodiantrix or custodianette.
 
Image: https://www.ancient-origins.net/myths-legends-europe/janus-figures-0011548
 
Reference: Online Etymological Dictionary, https://www.etymonline.com/