I'm aware of
game.StarterPlayer.EnableMouseLockOption = false
which allows me to force a player out of mouse lock or enable them to shift-click it. However, I'm trying to force the player into mouse lock mode any suggestions?
Using a localscript and UserInputService, you can lock the mouse in the center as so:
game:GetService("UserInputService").MouseBehavior = Enum.MouseBehavior.LockCenter
More info can be found here