It seems I was not the only one who ended up with a broken outside door handle while the child lock is on.
A common problem with these door handles is that the cable end will slip out from the handle groove and become loose. If you are still able to see the cable end while pulling the door handle, then you might be able to pull it using a pair of pliers. Otherwise, you can still try this method:
VWVortex.com - My door won't open NEED HELP!!
If none of those methods work (like it was the case for me), here's how you can open the door. There might be some less invasive ways of doing this, but if there is, I couldn't find it on the web. I actually spent more time searching than it took me to fix it that way.:
1- Unscrew the 17mm nut on the back seat hook, remove the hook, then the seat side cushion by pulling it up.
2- Remove the plastic trim by unscrewing the top and bottom Torx screws.
3- Now you need to drill a hole that will allow you to reach the child lock screw from the interior. I initially took my reference from the other door, but ended up a bit too much towards the door side. So your whole should be a bit further from the door than shown on my pictures. Taking the top and edge of the metal plate as a reference, I would suggest the location of the hole to be at 45 mm from the top and 20 mm from the edge (see the red dot on the pictures). That should work fine on a B5.5. If you have another vehicle type, then you need to take your reference from the other door.
I used a 1/2" drill bit as I was not perfectly sure of the location. Now that you have a better reference, you might want to start with a 1/4" and make it larger if you can't reach the child lock screw the first time.
Note that you'll have to drill through two metal plates. BE CAREFUL when drilling the second layer as you don't want to damage the door by going too far.
4- Using a flat screwdriver, remove the child lock... and open the door.
5- Plug the hole using a latex based caulk which you can touch up with paint on the exterior side.
6- Next step is to fix your door handle problem. From this point, now that your door is open, you can search the forum for your specific problem.
Hope this is helpful.