Public Restroom, Knock or Walk?

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I went with my husband yesterday to an appointment. It was over a half hour drive to get there, so needless to say by the time we got there, I had to really go. Too much coffee. As he was checking in, I spotted the two doors to the right. Men and Women. I made a beeline to the door, and as I always do, I knocked first and waited for a reply. Nothing. A first that nobody was in the restroom when I really had to go. I'm not even in there about 20 seconds when someone was at the door trying to get in. No knock, no nothing at all. Well, she finally stopped trying to open the door. At this point, I'm thinking she is waiting out there so I'm trying moving as quick as I could. I'm washing my hands now, and there is a knock on the door. This time I answer that I'll be out in just a minute. Next thing I know, the handle is being messed with again. I figure she didn't hear me so I repeat what I've already said. Quiet again. I leave the bathroom, and there was an employee outside with bags of medicine in her hand darting by me to get into the bathroom. Thank goodness for locks, right. How about you? Do you try the door first or knock first for the Public Restrooms?