Just my luck , he was n't in his office . I made my way upstairs to my door and put the key into my door . My door would n't unlock ... great , I really had screwed up my key .

Question: What did I do to my key , so that it would n't work to open my door ?
Answer: I accidentally twisted the key out of shape .I accidentally straightened the key into shape .I left it in my pocket where nothing happened to it .I left it in my backpack where nothing happened to it .