Debounce not working?

I have a debounce that should make it take 5 seconds to use this hopperbin again. However, it doesn't work! It works a little, but not for 5 seconds. Please help.

local tool = script.Parent 
local plr = tool.Parent.Parent
local db = false

tool.Selected:connect(function(mouse)
	mouse.Button1Down:connect(function()
		if db == false then
			db = true
			local target = mouse.Target
			print(target)
			if game.Players:GetPlayerFromCharacter(target.Parent) then
				if (target.Parent.Torso.Position - plr.Character.Torso.Position).magnitude <= 7 then
					target.Parent.Torso.Velocity = plr.Character.Torso.CFrame.lookVector * 150
				end
			end 
		end
		wait(5)
		db = false
	end)
end)

all u gotta do is

touching = false

function() if not touching then touching = true --code touching = false

or if it's other stuff then u can rename the touching...

I'm thinking instead of putting db put the actual word "debounce". Maybe that would work.