Help with LDR - game

Hey, I’m doing a project in school where I will do a game where a LDR is needed to turn on and off some LEDs. Basically; When you put your hand over the LDR the value lowers, and I have made an if-statement and then a for-loop telling the LEDs to turn on when the LDR value is lower than the treashold. I want it to delay randomly between some seconds before the LEDs are turned on, that is all done. But my problem now is, when i remove my hand from the LDR it keeps delaying the same amout of time that the LEDs were turned on.

So, how can I make it so that when I take away my hand from the LDR the LEDs turns off again immediatley?

I use the Serial.begin(); and then i use the delay the intire serial monitor is delayed.

Here is my code:

int sens = 0;
int redPin[] = {2, 3};
int place = 2;
boolean set = HIGH;

void setup()
{
  Serial.begin(9600);

  for(int i = 0; i<place; i++)
  {
    pinMode(redPin[i], OUTPUT);
  }
}

void loop()
{
  int val = analogRead(sens);
  Serial.println(val);
  delay(450);

  if(val<240)
  {
    delay(random(1000, 5000));

    for(int i = 0; i<place; i++)
    {
      digitalWrite(redPin[i], set);
    }
  } 
  else
  {
    for(int i = 0; i<place; i++)
    {
      digitalWrite(redPin[i], !set);
    }
  }
}

So, how can I make it so that when I take away my hand from the LDR the LEDs turns off again immediatley?

Get rid of the delay() call. Look at the blink without delay example for inspiration.