Brake (2012)

Brake is a claustrophobic psychological thriller starring Stephen Dorff as a secret service agent held captive inside a coffin-like container. Cut off from the outside world, he is subjected to interrogation, manipulation, and escalating psychological pressure. The film relies on isolation, paranoia, and moral dilemma rather than action or spectacle.

Från IMDB:
A Secret Service agent is held captive in the trunk of a car and endures mental and physical torture as terrorists attempt to extract information for their plot against the President of the United States.