How do I give a force field to a player with chat commands?

I am trying to make a lua script that allows you to ff any player or kill any player, I managed to figure out how to kill players. Using the following code:

local isAdmin {[TomIzBored] = true}
 
function findPlayer(name)
    for _, player in ipairs(game.Players:GetPlayers()) do
        if player.Name:lower() == name:lower() then
            return player
        end
    end
end
 
function onChatted(message, player)
    if message:sub(1, 5) == "kill/" and isAdmin[player.Name] then
        victim = findPlayer(message:sub(6))
        if victim and victim.Character then
            victim.Character:BreakJoints()
        end
    end
end
 
 
game.Players.PlayerAdded:connect(function(player)
    player.Chatted:connect(function(message) onChatted(message, player) end)
end)

How could I make another command that will allow me to forcefield a player by saying something like "ff/Player1" then it would force field Player1 or whoever I targeted?