Yes.
Won't be able to get a minivan from any of the big companies. Probably the same with the smaller ones.
What about a Heimish company?
For an additional driver, that could work*. Just make sure to use a corporate code that waives underage and gives free additional driver.
*My one experience with a similar situation was before I turned 25, I had a reservation with Enterprise in Brooklyn for a premium car. When I got there the agent said he can't give me a premium since I'm under 25.
I asked him if he can switch the reservation to have DW (over 25) as the main driver, and have me be secondary.
He said that would work, as spouses can drive for free as secondary without him adding anything to the rental.
Not sure if him adding me to the rental would've not allowed him to give us the premium.