How to call a function from server to client? [UNANSWERED]

I am trying to create a chat command (one you can type in-game and activate the function) to either lock someone in first person or allow them to zoom out once again. My problem is getting the command to send it to the players. So far I have this in the localscript:

function game.Workspace.OnClientInvoke(FirstPerson)
	game:GetService('Players').LocalPlayer.CameraMode = Enum.CameraMode.LockFirstPerson
end

function game.Workspace.OnClientInvoke(ThirdPerson)
	game:GetService('Players').LocalPlayer.CameraMode = Enum.CameraMode.LockFirstPerson
end

And this in the Server Script:

function onCommand(message, player)
	if message:sub(1, 12) == ":firstperson" and TrueAdmin[player.Name] then
	local CameraMode = Instance.new("Camera Mode")
	CameraMode.Parent = game.Workspace
	CameraMode.Name = "First Person"
	function CameraMode(player)
		local success, result = pcall(function() return CameraMode:InvokeClient(player) end)
			if success then
				print(result)
			else
				print("Not able to change Camera Mode")
			end
		end
	end
	if message:sub(1, 12) == ":thirdperson" and TrueAdmin[player.Name] then
	local CameraMode = Instance.new("Camera Mode")
	CameraMode.Parent = game.Workspace
	CameraMode.Name = "First Person"
	function CameraMode(player)
		local success, result = pcall(function() return CameraMode:InvokeClient(player) end)
			if success then
				print(result)
			else
			print("Not able to change Camera Mode")
			end
		end
	end
end
-- Chat commands are working. I have already got that and these are in a function.

EDIT: Edited on mobile. So pardon the missed tabs.

Thanks a lot for helping me out. I realize that I may have been asking quite a few questions, but thank you so much.

Your problem is that you're using ServerScriptStorage for storing something that you want to use to manipulate the client.

Look closer: ServerScriptService

See why it's not working now?

Store your RemoteFunction in ReplicatedStorage and then you should be set(: