Boring film

In last week I saw a bad film in my house: 12 men and a sentence (I don´t know if this is the name in english). The film was filmed in 1957 and happened in a unique place: a room where 12 men discussed about a sentence of a man. He killed or didn´t killl him father? The 12 needed had a absolut decision about the case. All the film remained in tha case until everybody decided the sentence. It was boring.