I could not figure out how to unlock my door

Early this morning, I came home after driving my son to the bus stop. I couldn't get my key to open the door to my house! I tried several times but the door was still locked! I used my cell phone to call my husband at work. I was frantic because I needed to get into the house so that I could get ready for work. I was very upset and he told me that I just locked the door minutes ago, so I had to just use the right key and turn it the correct way. He told me to calm down and try the key again. I tried it several more times and it finally worked! There was nothing wrong with the key but there was a problem with my brain. I was turning the key in the wrong direction. I had just used the key to lock the door before driving my son to the bus stop. That was just a few minutes earlier. Sometimes it is just so strange how my brain works.