Engine running and locked out

[lateconvert]

I started the engine yesterday morning to idle and defrost the windscreen and whilst I leaned in I must have activated the centre consol door release thingy. I then shut the door and shortly afterwards realised I couldn't get into the car through either door. I went to get my spare keys and blipper but that wouldn't activate the doors either.
It occurred to me that I was in a bit of a bind and I might have the engine running for rather a long time.
Then doh I remembered that whilst starting the engine I had pushed the boot release button to put something in the boot before I drove off. So I was able to activate the manual driver's door release from inside the boot.
Panic over, but my question is, if I hadn't had access to the boot what could I have done - or did I just miss something simple whilst panicing? (in case it happens again !)