[SamCarlberg]

You can use java.util.Timer and java.util.TimerTask to schedule something to happen in the future while your program still runs.

// local or class variables
final int solenoidDelay = 65; // milliseconds
final Timer myTimer = new Timer();
final TimerTask closeSolenoidTask = new TimerTask() {

    @Override
    public void run() {
        closeSolenoid();
    }
};

...

mySolenoid.open();
myTimer.schedule(closeSolenoidTask, solenoidDelay);