How do I make it so a block you enter gives you health?

My idea is that a brick that you enter (invisible, noncollision) will give you, say, 1000 health. Then when you exit the brick it will bring you back to 100 health.

Here's what I have so far:

local Heal = game.Workspace.Healer

Heal.Touched:connect(function(hit)
local humanoid = script.Parent:FindFirstChild("Humanoid") 
	if (humanoid ~= nil) then
		humanoid.Health = humanoid.MaxHealth ~= 1000
	end 
end)


Heal.TouchEnded:connect(function(leave)
local humanoid = script.Parent:FindFirstChild("Humanoid") 
	if (humanoid ~= nil) then
		humanoid.Health = humanoid.MaxHealth ~= 100
	end 
end)

local Heal = game.Workspace.Healer

Heal.Touched:Connect(function(hit)
local humanoid = script.Parent:FindFirstChild("Humanoid") 
    if (humanoid ~= nil) then
        humanoid.Health = humanoid.Health - 1 --SUBTRACTS HEALTH
    end 
end)