Make sketch wait for button

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// motion detector senses something then a door opens
const int MOTION_PIN = 2;           
const byte LED_PIN = 13; // LED pin - active-high
const byte BUTTON_PIN = 12;
#include <Servo.h>
Servo servo1;


void setup() 
{
	Serial.begin(9600);
	// The PIR sensor's output signal is an open-collector, 
	// so a pull-up resistor is required:
	pinMode(MOTION_PIN, INPUT_PULLUP);
	pinMode(BUTTON_PIN, INPUT_PULLUP);
	pinMode(LED_PIN, OUTPUT);
	servo1.attach(9);
}   

void loop() 
{
	int proximity = digitalRead(MOTION_PIN);
	if (proximity == LOW) // If the sensor's output goes low, motion is detected
	{
		Serial.println("Motion detected!");
		openDoor();
		holdDoor();
		closeDoor();
		holdDoor();
		// wait for pressed button to open door from insided then

		int button_state = digitalRead(BUTTON_PIN);
		if (button_state == LOW) // If the button press
		{
			openDoor();
			holdDoor();
			closeDoor();
			holdDoor();
		}
	}
	else
	{
		digitalWrite(LED_PIN, LOW);
		Serial.println("No Motion Detected");
	}
}  

void holdDoor(){
	servo1.write(90);
	delay(5000);
}
void openDoor(){
	servo1.write(0);
	delay(6000);

}

void closeDoor(){
	servo1.write(180);
	delay(6000);
}