"Force install date" not forcing the update to install on iPads

I manage several dozen iPads using Jamf Pro.  I have a restriction set to only allow OS updates after they are 30 days old.  Once the 30 days are up, I manually push out the update using the “Download and schedule to install” option, setting the “Force install date” one week in the future and selecting the specific version I want installed.  What I am seeing is that when the “Force install date” comes around, the update is not forced, but the user is allowed to continue using the iPad without updating the OS.  I expected them to be “forced” to update when this date happens.  Does “force” have a different meaning here?  What am I missing?  Also, if I choose “Download and install” it does not force the user to update the OS either.  Thanks for any insight.  I’m new to this world.