How do I get a Chance to Speak to him ?

Hey Folks, so there is this guy who works as a bank teller at my local bank . He is really hot and adorable in my opinion and I have spoken to him twice . The thing is that I very much so want to ask him out for coffee but I am really uncertain if I will get a chance to speak to him again mainly because I seldom go to the bank as I don't usually have much to do there (save for those rare instances when I have to deposit cheques) so I m really racking my brain on coming up with some excuse to see him again. Secondly I sorta am afraid of the possibility that if I do go in there I might end up at some others tellers booth and I would miss my opportunity. I did go in today but he wasn't there , perhaps on his break or he wasn't working , so I stood in line for a bit but then decided to leave . I just don't want to go in there randomly stand in line and then leave if he isn't there , the other employees at the bank might think I am odd lol . I know this is a really weird question to post on Yahoo answers but im young ,and naive when it comes to this whole love thing and I really like the dude and I want a chance to get to know him lol Thanks for your feedback :D