3. Relax
Sometimes, simply relaxing can help you to release the trigger finger.
The reason for this is that it will relax the muscles around the area. The muscles are of course what control the tendons, and so if the tendons are stuck, this might well mean that the muscles have become tight and stiff. Simply by relaxing the muscle then, you might allow the tendon to become unstuck so that you can then push again.
Remember as well that the muscles surrounding the area can further compress the tendon sheath and make it harder to move the area.
Finally, keep in mind that as we become more stressed and agitated, we actually increase inflammation and our sensitivity to pain. Therefore, the more we fight to move the finger and the more wound up we become doing so, the more likely it is that the finger will simply refuse to budget!
Likewise, simply forgetting about the finger (when possible) will sometimes be enough to allow it to regain normal function with time.