Social Distancing hand wash dispenser

int pir=0;
int sensor=0;
long readUltrasonicDistance(int triggerPin, int echoPin)
{
  pinMode(triggerPin, OUTPUT);//Clear the trigger
digitalWrite(triggerPin, LOW);
  delayMicroseconds(2);
//Sets the trigger pin to HIGH state for 10 milisecond(s)
digitalWrite(triggerPin, HIGH);
delayMicroseconds(10);
digitalWrite(triggerPin, LOW);
pinMode(echoPin, INPUT);
//Reads the echo pin, and returns the sound wave travel time in microseconds
  return pulseIn(echoPin,HIGH);
}
void setup()
{
  pinMode(11,INPUT);
  pinMode(6, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(3, OUTPUT);
  Serial.begin(9600);
}

void loop()
{
  pir=digitalRead(11);
  sensor=0.0173*readUltrasonicDistance(13,12);
  Serial.println(sensor);
  delay(500);//Wait for 500 milisecond(s)
  if(sensor<= 200){
    digitalWrite(3, HIGH);
    if(sensor <= 20){
      if(pir==HIGH){
      digitalWrite(6, HIGH);
      }
      if(pir==LOW){
        digitalWrite(6, LOW);
      }
    }
  }
  else{
    digitalWrite(6, LOW);
    digitalWrite(3, LOW);
    
    
  }
}