This is a wonderful post from Answers in Genesis.
by Ken Ham
Over 6,000 years ago, a “door” was shut to a garden. Because Adam sinned, God sent Adam and Eve out of the Garden:
Now, lest he reach out his hand and take also of the tree of life and eat, and live forever—therefore the Lord God sent him out from the garden of Eden to work the ground from which he was taken. He drove out the man, and at the east of the garden of Eden he placed the cherubim and a flaming sword that turned every way to guard the way to the tree of life (Genesis 3:22–24).
Because of Genesis 3:15, we understand that God told Adam and Eve that someone would come to open the “door,” leading back to the Tree of Life: “I will put enmity between you and the woman, and between your offspring and her offspring; he shall bruise your head, and you shall bruise his heel” (Genesis 3:15).
In the Old Testament, prophets predicted that this someone would come: “For to us a child is born, to us a son is given; and the government shall be upon his shoulder, and his name shall be called Wonderful Counselor, Mighty God, Everlasting Father, Prince of Peace” (Isaiah 9:6).
We also understand that when God told Noah to place one door in the side of the Ark, so that those who went through that door would be saved from the judgment of the Flood, this door was a picture of the one who would come to open the “door,” for he “set the door of the ark in its side” (Genesis 6:16).