'Doorkeeper' in the Bible

It is like a man away on a journey, who left his house and gave his slaves authority--to each one his work--and to the doorkeeper he gave orders that he should be on the alert.

For this one the doorkeeper opens, and the sheep hear his voice, and he calls his own sheep by name and leads them out.

But Peter was standing by the door outside. So the other disciple [who was] known to the high priest went out and spoke to the doorkeeper and brought Peter in.

Then the female slave [who was] the doorkeeper said to Peter, "You are not also [one] of the disciples of this man, [are you]?" He said, "I am not!"