How do you roll the vehicle when it stalls?

*sorry, this should be in E70 section*

Just a simple question, how do you put the X5 in neutral when engine is not running, so it can roll freely when it stalls/runs out of gas.. Today -waiting on the gas line that extended for over 5 blocks in NYC- I thought to myself what I run out of gas by the time i reach there.. Since I was on a hill I tried to turn the engine off and roll it, of course it didn't happen.
What would happen if I run out of gas? How do I roll the x5 down the hill or push it?