Unable to Unlock Xiomi Device

Support
1

Using Xiomi Note 4 Device, Appium version 1.7.2 ,Eclipes Oxygen.
Am trying to unlock pattren i have given the valid pattren key.

import java.net.MalformedURLException;
import java.net.URL;
import java.util.concurrent.TimeUnit;

import org.openqa.selenium.By;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.remote.CapabilityType;
import org.openqa.selenium.remote.DesiredCapabilities;

import io.appium.java_client.MobileElement;
import io.appium.java_client.android.AndroidDriver;
import io.appium.java_client.remote.MobileCapabilityType;

public class Webapp {

public static AndroidDriver<WebElement> driver;


public static void main(String[] args) throws MalformedURLException, InterruptedException {
	// TODO Auto-generated method stub
	DesiredCapabilities  cap = new DesiredCapabilities();
	cap.setCapability(CapabilityType.BROWSER_NAME, "Chrome");
	cap.setCapability(MobileCapabilityType.DEVICE_NAME, "android");
	cap.setCapability("unlockType", "pattern");
	cap.setCapability("unlockKey","2583");
	driver = new AndroidDriver<WebElement>(new URL("http://127.0.0.1:4723/wd/hub"),cap);
	driver.get("http://google.com");
	driver.manage().timeouts().implicitlyWait(10l, TimeUnit.SECONDS);
	driver.findElement(By.name("q")).sendKeys("hello Appium");
	Thread.sleep(3000);
	driver.quit();
	

}

}