I've been thinking of giving picking up girls in local cafés a chance but was wondering if a simple & honest approach like this would work: for example i'm having a drink in a bar with some friends & see a cute girl with a friend of hers, friend goes to the toilet & she's alone for a moment would it be fine to just do the following?;

me: Hey, can i interrupt for a moment?
she: yes sup?
me: i saw you sitting here & thought you looked really cute, introduce myself & ask her name
she: gives name etc,
me: keep very short conversation -> can i maybe get your facebook? I would love to get to know you better.

Does a simple straight forward approach like that work?

PS: yeah i wrote it out i have some serious approach anxiety so when i go in i want to have a set opener i want to use unless ofcourse i see something else i want to talk about but last week i just saw a really cute girl in our local bar & couldn't get myself to speak to her as i didn't know how to open & the example above seemed to simple.

Thanks in advance for helping this noob!