Help With Restricting Player Movement For A Cutscene?

Currently I am making a Piggy-based game with some twists with another user. Recently, we are done with the main basics (keys, doors, menu, etc.) and I have decided to start on the cutscene. However, I don't want player movement, but I can't set their walk speed to 0 because they will be moving. I have heard that ContextActionService is a good way to begin, but I can't find anything that currently works. Here is the module I am using so far:

local module = {}

local replicatedStorage = game:GetService("ReplicatedStorage")
local restrictMovement = replicatedStorage:WaitForChild("RestrictMovement")
local allowMovement = replicatedStorage:WaitForChild("AllowMovement")
--ContextActionService can only be used on the client from what I've heard.

function module:RestrictPlayerMovement()
	restrictMovement:FireAllClients()
end

function module:AllowPlayerMovement()
	allowMovement:FireAllClients()
end

The local script looks like this:

local replicatedStorage = game:GetService("ReplicatedStorage")
local restrictMovement = replicatedStorage:WaitForChild("RestrictMovement")
local allowMovement = replicatedStorage:WaitForChild("AllowMovement")

restrictMovement.OnClientEvent:Connect(function()
	--Don't know what to put here
end)

allowMovement.OnClientEvent:Connect(function()
	--Don't know what to put here
end)

The functions are empty because I have no clue on what to do here. If anyone can help me or has a different way of doing this, help will be greatly appreciated.

Thanks!