The Keeper of the Keys

[vheggie at yahoo.com]

No: HPFGUIDX 25796

"The Keeper of the Keys" is sometimes also called a "Concierge", from 
the French.  IIRC their job is to welcome and care for guests; 
originally in castles and mansions, and now, more commonly, in hotels.

Their job involves more than groundsmanship/security/symbolic door-
opening - they are also a personal assistant, or a provider of 
pastoral care.

As far as I can see, this suits Hagrid perfectly.