An Experiment in Murphy’s Law and Probability

I think I am unlucky. Not really, because I don’t believe in luck, but I figured I would try this experiment for amusement purposes. I have a little pouch with my 2 keys in it. The two keys are indistinguishable from each other at first glance, but only one of them opens the lock on my door. Every evening after work, I pick a key from the pouch at random and see if it opens the door. After 18 tries, one would expect around 9 first attempts to have been successful. But, naturally Murphy’s law prevailed, and that was not the case.

Of the 18 attempts, ONLY ONE succeeded on the first try. WHAT?