The better view might be "I have been told one 'key' to my calling is to have angels minister to men. Therefore, I know this is a critical matter, or a key to search into."
What if "holding a key" is better viewed as being given a strong guide or route to take? It points you to something you need to obtain. You have a "key" and now need to discover what it is that must be unlocked.
A "key" is something used to open a lock. It is also something that is "important" or "central in importance." A "keystone" is the point in an arch that fits in the center, holding the arch together. Upon it all else rests.
If the word is viewed using these meanings, it suggests that holding a "key" implies using it in action. The First Presidency and Quorum of the Twelve use their key positions to manage and maintain the worldwide church organization. If not for that constant oversight, the organization of the church would lapse into disorganization. Their "keys" are indispensable to hold the entire structure together. Without them at the center, like a "keystone," the "building" would collapse. But the Gospel (and the church) is not a spectator sport. Even if fifteen presiding authorities waste and wear out their lives keeping the church organized, no one will be saved by observing them. It devolves upon us, each one, to obtain the keys of our own salvation by a covenant with God.
Offices belonging to others are their responsibility. For you, there are "keys" which come to us in our own sphere. We are all asked to rise up in testimony and knowledge until, at last, we arrive at "the perfect day" of understanding. (D&C 50: 24.) We are all invited to come to know the Lord, see His face, and know that He is. (D&C 93: 1.)
Can you imagine what a different church it would be if we were all able to say we know for ourselves, nothing doubting, our Lord? Can you imagine how all the problems we now face would evaporate overnight, if our quest was to grow from grace to grace until we too receive of the Father's fullness? (D&C 93: 20.) Most of what now afflicts us would become trivial, left behind as we grow in light and truth. (D&C 50: 23-25.)
Our temple rites symbolize the trek back to the presence of God. All of us, male and female, receive the same ceremonial blueprint to build upon. Every person within the church should obey and sacrifice (for God and not man), then learn through service, the Gospel of Christ by walking in His footsteps.You agreed to undertake obedience and sacrifice before committing to following His Gospel. This order is critical. Without it, you could err in thinking the Gospel will come to you without sacrifice.
From the Lectures on Faith, Lecture 6:
This outlines the "keys" for your own salvation. Seek for these for they belong to each of us. Do not be jealous of church positions, they do not matter and are not necessary. One thing is necessary; therefore choose the better part. (Luke 10: 39-42.)