basic pb and led

int ledPin = 7;
int pbPin = 4;
int pbStatus = 0;
void setup() {
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT);
  pinMode(pbPin, INPUT_PULLUP);
  digitalWrite(ledPin, LOW);
}

void loop() {
  pbStatus = digitalRead(pbPin);
  if (pbStatus == LOW) {
    digitalWrite(ledPin, HIGH);
    delay(1000);
  }
  else {
    digitalWrite(ledPin, LOW);
    delay(1000);
  }
}