If you turned the key to the left to lock it then you'll have dead locked the boot, which is why pulling on the lever inside has no effect.
Presumably if you managed to deadlock the boot, then that lock is the master key and not the valet key.
Sounds like you lock's seized. My two has the same problem, just required a bit of wiggling to get it to move back.
Just thought I would update.
I eventually got in.
Drilling didn't work
So I took the side engine covers off and could just about get to the hinge. Used a small chisel to smash the pins out. Then the boot popped up from the back and I could reach through and pull the carpet down and open the boot.
Then spent the next hour repairing the hinges etc.
All working now, except I need a Rev3 boot lock and mechanism lol