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"I still missed the "POPE" part!"

Only because you are not thinking! Pope is not an English word - WHAT DOES IT MEAN?

When you have worked out what it means, you will find it in the following passage which Hermann quite correctly quoted for you:

Isaiah 22.20 And it shall come to pass in that day, that I will call my servant Eliacim the son of Helcias,
21 And I will clothe him with thy robe, and will strengthen him with thy girdle, and will give thy power into his hand: and he shall be as a father to the inhabitants of Jerusalem, and to the house of Juda.
22 And I will lay the key of the house of David upon his shoulder: and he shall open, and none shall shut: and he shall shut, and none shall open.

Eliacim was the major domo/prime minister/vicar of the Davidic kingdom. This is the only passage in the whole OT where keys are referred to in a theological context. This is the passage that Jesus meant you to think of when he said to Peter "I will give to you (singular) the keys of the kingdom....."