I’ve been watching quite a few classic films recently, and in no particular order, here are the ones I’d recommend:

“Suddenly” 1954 - Frank Sinatra knocks it out the park as a bad guy :)

“Kiss Me Deadly” 1955 - There’s a scene near the end where the femme fatale opens a box, as soon as I saw it - OMG! I swear Lucas and Spielberg were inspired by this for the bit in Raiders when they open the ark…

“Shadow of a Doubt” 1943 - Not my favourite Hitchcock, but still worth a watch.

“A Man Escaped” 1956 - Does so much with so little! “A captured French Resistance fighter during World War II engineers a daunting escape from a German prison in France.” (IMDb synopsis).