Revelation 3:7
"To the angel of the church in Philadelphia write: These are the words of him who is holy and true, who holds the key of David. What he opens no one can shut, and what he shuts no one can open.
Matthew 16:19
I will give you the keys of the kingdom of heaven; whatever you bind on earth will be bound in heaven, and whatever you loose on earth will be loosed in heaven."
In the Davidic kingdom of the Old Testament, the king's vice-regent (or "prime minister") kept in his possession a key which was contained in a pouch worn over his shoulder. The key represented the vice-regent's authority and office. In the king's absence the vice-regent held full plenary authority.
If you read Isaiah 22 you will see that the king strips Shebna of his office and gives his authority over to Eliakim "placing on his shoulder the key of the House of David."
Ultimately, the "keeper of the keys" is the king. In the Old Testament, the ultimate "keeper of the keys" is the king of the Davidic kingdom. In the New Testament, we see that the ultimate "keeper of the keys" is the New King of the Davidic kingdom, Jesus Christ (Rev 3:7).
Finally, Jesus gives the keys of the office or "the keys of the kingdom" to Peter in Matthew. The keys represent an earthly office, specifically the position of "vice regent" or "representative of Christ (vicar of Christ)" in the King's "absence."
So you may not use OUR scriptures to prove anything about your church...get some other infallible proof...