Hi all, brand new here (bit of an awkward first place to post, but such is life

).
Car is a UK 2015 GD 5 Door Hatchback, Diesel 1.6CRDi, manual, second facelift if I read wikipedia pictures correctly.
Very recently, the front passenger door stopped opening, and cannot be opened from the inside or outside. Central locking repeatedly does nothing. I can hear it clicking on the pax door but no results.
If I pull on the interior door handle, I can see the cable moving with the handle and have tried to apply pressure to it (sticking a slot screwdriver onto the cable to push it), but with no results.
I've also tried using the central locking with the car running (to get more volts on the battery) to try and unlock it, but also no results.
Since the door is effectively jammed, I can't really get the door card off (once doesn't count) and as such have limited access to any internal stuff to look at things.
I've read a lot of issues on here concerning busted actuators and jammed mechanics, which appear to be a recurring theme, so really this is a bit of a cry for help in case anyone has any ideas before I throw in the towel and call up a mechanic. If I could just get the door open, I don't mind replacing something myself, but at the moment it's stuck fast. Any ideas?
Cheers,
Gopher