check if a player has called an event and is in a certain area???

im trying to do a thing where a local script calls an event when mouse3 is pressed it should open a door but only if you are touching a certain part

local callDoor = game.ReplicatedStorage:WaitForChild("callDoor")
local anim = script:WaitForChild("Animation")
local hum = script.Parent:WaitForChild("Humanoid")
local playanim = hum:LoadAnimation(anim)

local clickArea = script.Parent.ClickArea

callDoor.OnServerEvent:Connect(function()
--i need help here
end)

any help? :)