Here's a video that shows how far away from a car you can be and still NOT be safe from a suddenly opened car door.
This one shows what can happen if you get deflected into the traffic lane by an opening car door.
guy was lucky there were no vehicles in the lane he was knocked into.
I could post more but I'm sure you get the idea by now.
DON'T RIDE IN A DOOR ZONE! especially if there are stopped vehicles in it. Whether it's a bicycle lane or not, door zones are extremely hazardous to bicyclists.
Cheers