While modern films are becoming incredible exhibits, there is something iconic about contemporary examples from the past. One of the most striking and main examples of such a film is Sidney Lumet's 1957 work "12 Angry Men", which absolutely everyone should watch. I also want to leave for you an article
https://filmshortage.com/the-drama-issue-of-12-angry-men/ where you can read a short description about him. I highly recommend you check it out as soon as possible if you haven't seen it before.