Always
#Always ThisThis is somewhat of a frame challenge, but hear me out. You said:
I need to know them better in order to know how they will act in the story
Why is this any less true for minor characters than it is for main characters?
Archetypes are useful for outlining the defining features of a character. Their major traits and ideals. They don't give their personality, speech patterns, pet peeves, flaws or all the other minor details that make a character feel real. If you want a character make a character, not an archetype.
This may sound like a lot of work, however it doesn't have to be do bad. Not every actor in your story is a character. Some are extras, set dressing, scenery. The guy the MC buys a train ticker from is scenery. They don't need a name or a character. If you feel they have enough interaction to need a name, they are a character.
I would suggest finding a lower effort way of getting to know characters. A character discovery process that you can stop early for minor characters and continue on for the major ones. There is a lot of middle ground between archetype and fleshed out character. Work on creating your minor characters in that space.