Any time you have ever needed to enter a code into something, or a PIN number, you have needed to hit enter correct? It is common knowledge, that when confronted with having to enter a code, and you see a huge ENTER button next to it, you need to hit that enter button to confirm your code....
Where I work is a door, and there is a combination on it, and a huge ENTER button, but for some reason, no one understands this.... they put in the code, then attempt to open the door. And then enter the code again, and try once again to open the door, failing miserably..... Now this is a tad bit annoying but the REALLY annoying thing is..... throughout the building, are doors, with codes you must enter in, and you have to press the ENTER button to open the door, no one has problems with these doors. But for some reason, this one door, our door, it confuses everyone.