Force cage is a spell that allows you to create
An immobile, invisible, cube-shaped prison composed of magical force springs into existence around an area you choose within range pg. 243 PHB
Which makes it seem as though I can just place it on top of any creature
and
A creature inside the cage can’t leave it by nonmagical means.
Does this mean the spell caster can imprison almost any medium sized creature for a whole hour without the creature getting the benefit of a Save first?
It seems overpowered as almost any medium sized creature that cannot use magic or dimensional travel is almost guaranteed to be captured and even if it does if it has low Charisma and the spell caster casting this spell is a high level they almost have no means of escape. Am I reading this right?