Israel has mainly unisex bathrooms, so this is what I do - works best in cafe's, not in clubs and it shouldnt matter if there are other people waiting in line:
Jesper: (said cheekyish and a smile throughout) Excuse me ma'am, ummm, this is really embarassing, but could you watch the door for me? (assuming you are at a stall)
HB: hahahaha
Jesper: no! I'm serious! The lock is broken and (C&F) I'm really REALLY shy. As a matter of fact, I'm not even sure how I even started speaking to you! I'm afraid of girls..they are SUCH sexual predators! CAN I EVEN TRUST YOU!?(concerned, puppyish face - smile then start to walk in, assuming she will guard the door.)
HB: hahahaha yes yes you can
Jesper: I love you your the best!
If and this is often the case if there are others there she will says, 'why me?' or 'im sure no one will come in' just say: omg you are so rude! if Brad Pitt asked you to hold the door for him would you? She will say: of course, but are you Brad Pitt? PUA: Umm ya! I'm just stuck in this really UGLY guy's body for the day! Now watch the door!
Now let's go on...Don't go for a number 2 cos that would be fucken awkward as nuts. I repeat, DONT!
Go in and DONT lock the door - the lock is PROBABLY working!!
**POSSIBLE ADDITION IF YOU CAN PULL IT OFF**
Once you close the door, after a second start singing loud enough so she can hear you - sing a REALLY catchy song REALLY passionatley i.e. Culture club - do you really want to hurt me When she hears she will crack the fuck up. Shout through the door: HEY! DONT BE LAUGHING AT MY SINGING! I TAKE IT VERY SERIOUSLY!
HB: hhahahahaha OMFG
THEN you come out, joke about your singing for a second, then "thank you soooooo much for watching the door, it meant the WORLD to me" and go with the wash hands routine like above..."hey did you wash your hands? my mom always told me to wash my hands (mini-dhv)"
if you want, you can add in this bit just as you finish washing your hands - the last 3 words can be used quite well:
"You know, you weren't half bad at holding the door for me - we should be a team! everytime i go to the bathroom i will call my door-holding service and (slow it down a bit, maintain eye contact, smile) she will come! haha Evvverytime!" -----DONT make the naughty meaning obvious, say it like you didnt realize it and dont even bring it up after that it sounded sexual. Half the time, she WILL notice and if she does, neg her on it and RELATE BACK to sexual predator comment 'ewww you perv! I TOLD you that ALL girls are sexual predators' - then go into sexual predator routine).
If executed correctly, this routine is golden. 95% of the time she WILL stay - you were interesting as hell for asking her to watch the door!!
Let me know how it works for you
Jesper