This is a TUT on how to kick someone from your Pegasus if they happen to jack you from it or steal it before you could get to it.
It's only two step really.
Start > PS/XBOX Store > Let it load up > Exit out of it > Viola!
They are no longer inside your Pegasus vehicle.
Now you won't be able to get back in it even if you are able to see it, It'll be locked for you too but you can call for another one right away.
The LSC version of this has been patched but this way hasn't and no you can not use this method to duplicate the vehicles either sorry