“War of the Worlds”, “Forbidden Planet” and “Invaders From Mars” are probably the 3 all time great sci-fi movies from the golden age of flying saucer movies.
There is one I cannot recall the name of but it too stuck in my memory. It involved aliens from a flying saucer who looked pretty much like your standard aliens of the era.
They killed people by injecting pure alcohol into them. I remember one of their hands was severed and it still was able to function”. I recall there was a lovers lane where the kids all fed beer to a bull. He got so used to alcohol that the aliens steel plungers of alcohol had no effect on him.
The teenagers as was typical in those movies, saved the day. They found out that light destroyed them and turned their car lights on them.