Admit it! You've prayed for God to help you find your keys, or something equally as trivial. You opened your eyes and there they were. Then you've wondered why a loving God would answer your prayer and not those of the millions of starving people in Africa. Perhaps you begin to feel like the following blogger:
"If God is an interventionist, He's doing a piss poor job. He helps middle-class americans find their keys while thousands suffer and die in other parts of the world. If God is an interventionist, I don't think He's worthy of worship. If God isn't an interventionist, and we are on our own, what practical difference does it make if we believe in Him or not? Either way, I just don't see the point in worrying about God anymore. Either what He is like, what He wants, or even if He exists."
If so, you need to review your Mormon Doctrine. God allows suffering in this life to help us develop all the things that we need in order to become purified and return to live with him someday. No one can live in the presence of Deity unless they have become sanctified. Trials are part of the sanctification process. This does not mean an interventionist God personally hands you every bit of suffering you experience here. (Didn't you read my Good, Bad, and Ugly Adversity post?) But God will allow the suffering that is a mortal condition of this world so that we can develop our agency and become holy.
So why does he sometimes help us find our keys? He won't interfere in the vicissitudes of life which help us to grow and attain glory. But perhaps our lost items aren't enough of a trial to teach us anything. Maybe we've already developed the small amount of patience necessary to deal with lost keys. If so, God can help us out a bit without interfering with the learning process.
...or maybe they were just there the whole time.