I have written a small method. It basically calls to a service (not web service) to set a lock attribute. It does work, but I am interested in improving it. Should I really be running this in a new thread?

I have this running inside a do..while and I have no thread.sleep between calls.

I am using the stopwatch to record when its actually more than 20 seconds and I exit anyway as no lock was able to be set.

public bool ObtainLock(Uri lockUri)
{
    bool lockResult = false;

    var sw = new Stopwatch();
    sw.Start();
    do
    {
        lockResult = myService.SetLockBit(lockUri);
    }
    while (!lockResult || sw.ElapsedMilliseconds >= 20000);

    sw.Stop();

    return lockResult;
}

It just seems to me it could be improved, and the threading worries me. A note, the myservice isn't a web service, its just another method on a class so I can use Task<..> here.

And the stopwatch I am using, is that an acceptable way of implementing a timeout?