【door holder】 —a device for holding a door open:

• Babyproof your home by using door stops and door holders to make it safer for your baby.

door keeper—a man who stands at the door of an establishment and admits only those qualified to enter:

• We inquired of the door-keeper, whereupon a woman came out to see us.

Note: The expression does not correlate in meaning with the compound gatekeeper—

1. a guard who tends a gate:

• The receptionist finally gave the OK for the door to be opened by the gatekeeper.

2. a person or group that controls access to smb. or smth.:

• As our representative, they serve as our “gatekeeper” in controlling the flood of information from the various media organizations.