Personally I'd say not to be fixated on the opener, just because it's begun the conversation doesn't make it a necessary component to continue. Once the opener had run it's course I'd bridge to another subject, perhaps try to DHV.

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'Sometimes you wake up. Sometimes the fall kills you. And sometimes when you fall, you fly.'
Neil Gaiman

Most girls hold the delusional Hollywood fantasy of being "swept off their feet" ; This is what day game is all about. Personally I go direct with day game approaches with the line "Hi I saw you and had to meet you" as if some romantic instant chemistry had just occurred: Women love this and love to tell their friends about it.

The only caveat is you need to calibrate really well to segue into the next stage of the sarge or you'll generate an auto pilot response. Just keep talking and barrel through as if she's a friend you haven't seen in a while and she will drop into the frame.

I'm saying to try situational openers. The burrito indirect opener is canned and would likely come off as canned unless you're at a burrito shop or in the tortilla aisle of a grocery store. Don't go in with anything to say. Comment on something in the immediate vicinity.

Can close within 2 to 3 minutes.

Sure you could try to talk to her for 15mins but why when you could a) potentially run out of things to talk about and the energy could completely stall b) potentially meet 4 more girls in that time.

If you and the girl are vibing you can talk about ANYTHING and she will be into it. You don't have to state your intentions to a girl; as guys we tend to think that's needed but if you're giving off the right energy she can tell instantly. For the close, something as simple as "Hey you're cute but I gotta get back to X. Why don't I take your # and we'll continue this."

As the last poster says, talk to her like you already know her and you'll be miles ahead of other guys out in "the field."