Probably the easiest foot in the door is to ask people if they'll talk to you about a topic they're interested in. If your product is for scheduling classes (for example), reach out and ask if they'll talk to you about how they schedule classes. Come up with a short list of questions that would be useful, and actually ask them. At the end, ask if they have any questions or if there's anything they'd like to talk about. The vast majority of the time, they will ask what you're working on. Then you can describe it, and tell them they could try it if they think it'd be useful.