There are several features such as the bones of the earth spell which states:
[...] If a pillar is created under a creature, that creature must succeed on a Dexterity saving throw or be lifted by the pillar. A creature can choose to fail the save...
The Sorcerer's Careful Spell Metamagic option which states:
When you cast a spell that forces other creatures to make a saving throw, you can protect some of those creatures from the spell’s full force. [...] A chosen creature automatically succeeds on its saving throw against the spell.
And the compulsion spell which states:
[...] A target automatically succeeds on this saving throw if it can’t be charmed...
In cases like these does the target creature roll dice at all? Have they even made a saving throw?