The Pub: A Puzzle Psychopath's Trap

You’re at the Pub. There’s no one except for you and a weird looking barman. You order a beer. As you take the first sip, you realize that the barman has vanished. By the time you realize there might be trouble, you find a masked man pointing a gun at you. He locks you inside, stating he is a puzzle psychopath who has prepared a series of puzzles which need to be solved for you to escape. Before locking you, he detonates a bomb which he says will explode in 60 minutes and which is impossible to diffuse. There must be a way out. You’ve got 60 minutes.