Sensor door (buggy)

print("start")
whitelist = {"furest","arthuremen1"}
print("whitelist done")
os.loadAPI("ocs/apis/sensor")
mysensor = sensor.wrap("left")

-- vérifie si le joueur détecté est whitelist
function checkexist(nickname)
  for key, nom in pairs(whitelist) do
    if nom == nickname then
      return true
    end
  end
return false
end

--Ouvre la porte
function Ouvre()
rs.setOutput("bottom", true)
sleep(0.2)
rs.setOutput("bottom", false)
return true
end

--Ferme la porte
function Ferme()
rs.setOutput("right", true)
sleep(0.2)
rs.setOutput("right", false)
return true
end


--Distance du centre de détection
local offset = {
X = 0,
Y = 8,
Z = 0
}
local rayon = 3

--Calcule la distance
function distance(pos)
  local xd = pos.X - offset.X
  local yd = pos.Y - offset.Y
  local zd = pos.Z - offset.Z
  return math.sqrt(xd*xd + yd*yd + zd*zd)
end

function nearby()
    print("check")
    t = mysensor.getTargets()
    print("targets got")
    for name, details in pairs(t) do
        print(name)
        if details.Name == "Player" then
            local x = mysensor.getTargetDetails(name)
            print(x.Username)
            if checkexist(x.Username) and distance(details.Position) < rayon then
                print(x.Username .. " is there!")
                return true
            else
            return false
            end
        else
            return false
        end
    end
end
while true do
proche = nearby()
    if proche then
        Ouvre()
    else
        Ferme()
    end
end