key lock

Ok so, the person who answered your question is a bit demeaning, but he is correct. There's a logical explanation---I'll tell you what I've done before in my 2013 Honda Accord. I have had an identical situation. Basically this: I dropped my keys into the middle area in a cupholder. My husband was on the other side of the vehicle with his keys and one of us accidentally pushed the button on the handle outside, locking it without realizing it. Then, he left into the house and I remembered I still hadn't grabbed something out of the car I needed. It was locked with my keys inside..... So I had to go get his and unlock it. The second time this situation happened, he was already gone. So, if your second key is close enough to your car (like sitting in a car next to your car) when one of the outside buttons get pushed, that key will be what the car uses to say it's ok to lock because that key can be used to unlock it, as it is also outside of the Honda Accord. It's one of the only scenarios that allow you to lock your keys in the car. Having your keys in the car alone should absolutely never allow you to push the lock button if there are no other copies around the outside of your vehicle (it will just beep at you). Hope that helps to explain.

Does my 2004 Honda Accord have a hidden key hole if the release lever stops working for entry into the trunk?