Real button calibrate

const int ledpin = 12;
const int photopin = A0;
const int button = 5;
unsigned long timeValue = 0;
int minVal = 1000;
int maxVal = 0;
int photoValue;
bool check = false;


void setup()
{
pinMode (photopin, INPUT);
pinMode (ledpin, OUTPUT);
Serial.begin (9600);
}

void calibrate()
{
  if (digitalRead (button) == HIGH);
  digitalWrite (ledpin, HIGH);
  timeValue = millis();
  while(millis()-timeValue<5000)//sets the time it takes to callibrate 5 seconds
  {
    photoValue = analogRead (photopin);//This is used to callibrate the photoresistor (place your hand on and off of the photoresistor to get the resistor to see the max and min
    if (photoValue<minVal)
    {
      minVal = photoValue;
    }
    if (photoValue>maxVal)
    {
      maxVal = photoValue;
    }
  }
  digitalWrite (ledpin, LOW);
  Serial.println ("I am in");
}

void loop()
{
  photoValue = digitalRead (button);
  Serial.println (photoValue);
  if (check==false)
  {
    Serial.println ("check is true");
    if (button==1)
    {
      Serial.println ("button is read");
      calibrate();
    }
    else
    {
      Serial.println ("check is false");
      check = true;
    }
  }
photoValue = analogRead (photopin);
photoValue = constrain(photoValue, 0, 255);//makes min and max values 0 and 120
photoValue = map (photoValue, minVal, maxVal, 255, 0);//maps 255-0 along 0-120
Serial.println (photoValue);
analogWrite (ledpin, photoValue);
}