Why wont it set the players heath to 0 help?

So bassicaly i made a part that kill player when u is close, but when u are close it does not kill the player pls help:

while true do
    wait()
    local player = game.Players.LocalPlayer
    local char = player.Character
    local distance = (workspace.LivingroomMonster.Position - char.LowerTorso.Position).Magnitude 
    if distance > 25 then
        print("Far form  monter")
    else
        char.Humanoid.Health = 0
    end
end