Schedule function problems

Here's a piece of code that's supposed to install an upgrade on a player wich turns itself off after five seconds. I can't use setTimerOn for this because it's already used to set the rate of fire. The DisableUpgrade function is executed immediately, and not after five seconds, so the upgrades simply never work. What am I doing wrong?

function Player::InitUpgrade()
{
switch ($Level)
{
case 1: %Number = (getRandom(0,10000) % 3) + 1;
}
echo(%Number);
switch (%Number)
{
case 1: MessageDisplay.setText("Double Fire!");
case 2: MessageDisplay.setText("Rapid Fire!");
case 3: MessageDisplay.setText("Controls reversed!");
}
$PlayerShip.Upgrade = %Number;
$PlayerShip.schedule(5000,$PlayerShip.DisableUpgrade(),"");
}

function Player::DisableUpgrade()
{
$PlayerShip.Upgrade = 0;
MessageDisplay.setText("...");
}