Hi mate, the window regulator has gone on mine as well, it's usually the cables that seize and snap. You will probably find the motor is still ok. So even though your window wont drop down like it should, you can still open the door, but just be careful. The window glass has a bit of flex in it so will bend a bit when you open the gate.
The door catch works independently from the window motor, so it should still work, can you hear the solenoid activating when you pull the handle, if so, then it's possible to open the door.
Try putting your rear wash/wipe on, if they dont work, there is a sensor in the regulator that can tell when the window is not fully closed and disables it.
I probably don't need to tell you a new one is about �300 fitted, so, if like mine , the door still opens and locks, then you get used to pushing the top of the window in slightly when you open and close the tailgate.
Hope this helps