I have come to a conclusion about these sorts of things. If a guy likes you. If he finds you attractive, even if he is also shy, he will make an effort to talk to you. It may be horribly awkward, on both your parts, but the attraction is there, and can be communicated.
You can help him along, you can maybe just ask him how his day is going. Joke about something, ease into it. It’s not easy to get to know someone especially if you can’t interact on a social level that doesn’t involve him behind a counter. Without stalking him, find out his interests that match up with yours.
Also, a little advice about the body language thing, it’s a rocky road. Especially since most guys don’t purposely place their bodies to us, like we tend to do to them. At least this is what I have learned from observing things, and misinterpreting men’s body language before. It’s usually a mess. A horrible awkward mess.
So, I say this, because it’s usually the safest bet… If he finds you attractive, or interesting he will, in his own way try and express that, or befriend you.
A progression over 3 years, actually my blog will be 3 this month, in a couple days.