I remember seeing a movie it was in black-and-white about these men that were held captive in a basement and it was a trap door. Every time the captor opened the trap door the men would threaten to escape and kill him. I don’t remember if the movie was about him forcing them into a labor camp or something like that. The movie ended where the captor opened the trap door, tripped and fell into the basement. The men jumped him and killed him. I don’t remember who the actors were but I remember being freaked out by this particular movie when I was a kid.