Magic Locked Doors?

[What_is_your_ip]

So I had to quit 4 times all ready because of magic locked doors.

 

I did shot out windows to see if that will unlock the door NOPE.

[NotaCobra]

It's usually a objective marker bug;

 

The locked door you see is actually the route you'll take when exiting the level, it stays locked until you complete the objective (find hostage, destroy reactor, find artefact etc).

However, occaisionally the objective marker, (the ! you follow) will place itself behind the door, despite the objective actually being in another direction.

 

Explore the level a bit more, and you should find the correct path.