This thread was created to gather all topics about the issue where the door is locked during the mission ‘Spiking the Guns’, that may occur if a crash or a logout happens during the mission. There are currently 19 individual topics about the same issue.
One of the possible fixes is to simply leave the mission for a while, return back later and the doors will have unlocked. Try it, see if that works for you.
Will add more here as they are created.