I watched a number of WW2 holocaust movies some years ago and one had a scene that always stayed in my head but I have never been able to find it.

I remember very little about the film, even if it was English language or subtitled but there was a scene where an elderly man is so traumatised by being in a concentration camp that he doesn't notice he is pushing his own wife's body into a furnace.

I'm pretty sure it's none of the bug name movies that come up in searches as I have read descriptions or re-watched most of them but suggestions are appreciated. Thanks.