Philosophy on Relationships

View each person as a locked safe of experiences and wisdom that one cannot access until they (you) find the key.

Sometimes the key is a common interest that allows you two to open up to each other. Other times it can be a moment shared without any form of verbal communication. Whatever the key may be, I find it the part of relationships that intrigues me the most. How do I get to know this person?

How can one get past that initial barrier that people shield themselves with to strangers?