Cache client not honoring Expiry

[rhinmass]

I'm not seeing entries expiring according to the Expiry date.

	public static void main(String[] args) throws InterruptedException {	
 		String[] servers = { "localhost:11212" };
		Integer[] weights = {1}; 
		SockIOPool pool = SockIOPool.getInstance("Test2");
		pool.setServers( servers );
		pool.setWeights(weights);
		pool.setMinConn(2);
		pool.setMaxConn(20);
		pool.setFailover( true );
		pool.setInitConn( 30 );
		pool.setMaintSleep( 90 );
		pool.setSocketTO( 2000 );
		pool.setAliveCheck( true );
		pool.initialize();
		MemCachedClient mcc = new MemCachedClient("Test2");

     	Date expiration = new Date(System.currentTimeMillis()+3000);		
		mcc.set("pet", "cat", expiration);
		String value = (String) mcc.get("pet");
		System.out.println("before sleep: got " + value + " from the cache");
		Thread.sleep(4000);
		value = (String) mcc.get("pet");
		System.out.println("after sleep: got " + value + " from the cache");
	}

Results:
before sleep: got cat from the cache
after sleep: got cat from the cache

I expected the second get to return null, as the entry should have expired in 3 seconds. Am I missing something?