How do I anchor a character without the animation breaking?

This works for me(local script)

local human = game.Players.LocalPlayer.Character
local defaultWalk = human.WalkSpeed -- defines the walkspeed(how fast humanoid walks)
local defaultJump = human.JumpPower -- defines the jumping power ( how much power to jump)
human.WalkSpeed = 0 --prevents player from walking by setting the speed to 0
human.JumpPower = 0 -- prevents player from jumping by making jumppower to 0
human.PrimaryPart.Anchored = true -- this looks unnecessary as you already setted walk and jump to 0, but this is important so the thing wont move when it is pushed by other thing

wait(5)--period of time for player being anchored

human.WalkSpeed = defaultWalk 
human.JumpPower = defaultJump
human.PrimaryPart.Anchored = false

if you want to access from normal script, add a new remoteevent named "freezePlayer" in replicatedStorage or wherever you want to go

--code

--code

--you come to point where you want to anchor the person
local freezePlayer = game.ReplicatedStorage:WaitForChild("freezePlayer") -- defines the freezePlayer event inside Replicated Storage
freezePlayer:FireAllClient() --fires the client(client is basically a player, so this is sending this event to all the client(Players) 

then, add this to local script(store local script inside starterPlayer > starterplayerscript

local freezeMe = game.ReplicatedStorage:WaitForChild("freezePlayer") -- waiting for the event to load to prevent from game to define something that still does not exist.

freezeMe.OnClientEvent:Connect(function() -- starts to run when the script( the one on above) fires the event

local human = game.Players.LocalPlayer.Character
local defaultWalk = human.WalkSpeed
local defaultJump = human.JumpPower
human.WalkSpeed = 0 
human.JumpPower = 0 
human.PrimaryPart.Anchored = true

wait(5)

human.WalkSpeed = defaultWalk 
human.JumpPower = defaultJump
human.PrimaryPart.Anchored = false
end)

I know that there is more faster ways to do it, but I am still a starter at scripting so sorry if these scripts is inefficient. Hope this works :D