Funny, the Apostles never said we have 'keys'. Only the faith preachers and those who follow them do. Here are all the Scriptures mentioning 'keys' and it appears Jesus was referring to the authority He was giving the Apostles...
Matthew 16:19 (KJV) And I will give unto thee the keys of the kingdom of heaven: and whatsoever thou shalt bind on earth shall be bound in heaven: and whatsoever thou shalt loose on earth shall be loosed in heaven.
Luke 11:52 (KJV) Woe unto you, lawyers! for ye have taken away the key of knowledge: ye entered not in yourselves, and them that were entering in ye hindered.
Revelation 1:18 (KJV) I am he that liveth, and was dead; and, behold, I am alive for evermore, Amen; and have the keys of hell and of death.
Revelation 3:7 (KJV) And to the angel of the church in Philadelphia write; These things saith he that is holy, he that is true, he that hath the key of David, he that openeth, and no man shutteth; and shutteth, and no man openeth;
Revelation 9:1 (KJV) And the fifth angel sounded, and I saw a star fall from heaven unto the earth: and to him was given the key of the bottomless pit.
Revelation 20:1 (KJV) And I saw an angel come down from heaven, having the key of the bottomless pit and a great chain in his hand.
That teaching is conspicuously missing (that we have the keys) in the Letters of the Apostles and to the Churches in Revelation.