Hot water heater question?

Our hot water heater is downstairs in the basement, and last night we ran out of propane. So we called the guy and told them that we were out of propane, so he came right away this morning and put some in. He asked me if I wanted him to light the pilot light and I said yes because I have no idea how do it. So he lit it and when I got home this afternoon the pilot light was out, so I tried to light it again because he showed me how, it stays lit for about 5 mins and then it shuts off. When I move the water heater just a little bit there seems like there's not hot water in it. Please help me I don't know what to do! Thanks