Player who owns tycoon touches other tycoon doors and no one can purchase them?

owner = script.Parent.Parent.Parent.ownerName
oreMachine = script.Parent.Parent.Parent.machineOn

factoryPrice = 250

local debounce = false

function onTouched(hit)

    if (debounce == false) then

        debounce = true

        local check = hit.Parent:FindFirstChild("Humanoid") --Find the player's humanoid that touched the part.

        if (check ~= nil) then --If the check finds a player humanoid, then...

            local player = game.Players:GetPlayerFromCharacter(hit.Parent) --Find the player who touched the part among everyone else in the game.

            if (player:FindFirstChild("leaderstats"):FindFirstChild("Cash") ~= nil) then

                if (player:FindFirstChild("copperFactory") ~= nil) then --Check if the player already owns this type of factory.

                    -- :)

                else

                    local player = game.Players:GetPlayerFromCharacter(hit.Parent) --Find the player who touched the part among everyone else in the game.

                    local cash = player.leaderstats.Cash.Value --Sets the player's Cash leaderboard stats to a local variable.

                    if cash >= factoryPrice then

                        player.leaderstats.Cash.Value = player.leaderstats.Cash.Value - factoryPrice

                        owner.Value = hit.Parent.Name --Save player's playername in the OwnerName StringValue.

                        local ownedFactory = Instance.new("StringValue") --Add a StringValue to the player to show the game that they already own this type of factory.

                        ownedFactory.Name = "copperFactory"
                        ownedFactory.Parent = player

                        wait(0.65)

                        script.Parent:remove() --Delete the Door part.

                        oreMachine.Value = true --Turn on the machine.

                    end
                end
            end
        end

        debounce = false -- The change I've made
    end
end

script.Parent.Touched:Connect(onTouched)

I moved the line debounce = false below the check ~= nil statement

Before you need to pass the check ~= nil statement to turn the debounce back to false, and if it doesn't pass the check ~= nil, the debounce is true forever since it never gets turned to false