Heber C. Kimball, when discussing D&C 137, teaches that Adam was the gatekeeper of the Celestial Kingdom.
Heber C. Kimball, "Remarks by President Heber C. Kimball, made in the Tabernacle, Great Salt Lake City, March 17, 1861.," March 17, 1861, Journal of Discourses, 26 vols. (Liverpool: George Q. Cannon, 1862), 9:41
We must become like the limbs of one tree, filled with the fragrance and nourishment that arise from the roots; then we shall be clothed with power and authority—then we shall have care one for the other. If we do not unite our efforts in this direction, we shall never pass through the strait gate that is Spoken of in the Scriptures, or what I will call the narrow gate. It is the gate that will only admit one man at a time. We are not going in all in confusion, as the sectarians suppose.
This brings to my mind the vision that Joseph Smith had, when he saw, Adam open the gate of the Celestial City and admit the people one by one. He then saw Father Adam conduct them to the throne one by one, when they were crowned Kings and Priests of God. I merely bring this up to impress upon your mind the principles of order, but it will nevertheless apply to every member of the Church.