how do I make a script On touch explosion?

part = script.Parent
plr = game.Players:GetPlayerFromCharacter(part)
wait = game:WaitForChild(plr)
while true do
    if plr and wait then
        local explosion = Instance.new("Explosion")
        explosion.Parent = plr.Character
        explosion.BlastPressure = 10000000
        explosion.BlastRadius = 3
    end
end

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