If a container is opened on its side with one's back to an unmovable object, the player will be pushed into the object or wall and become stuck even when the container is closed, only noclip ( tcl) (PC only) or reloading a save (PS3/Xbox 360) will fix this.

Also, turning your system off and on again may fix the problem. This will get you locked in the lab where you must freeze the aliens and Elliot's team, with no way back to Sally! Killing Elliot may fix the problem, but he must be with you when you kill him.