We suggest you using your key as a backup after installing the Sesame.
Is it possible for the lock to get stuck?
We've been using the lock for our own office for over a year and we have no issue with it, and none of our customer had that experience either. Also, the Sesame itself is pretty solid and we do QA on each Sesame before we send it out. We understand your concern but it is very unlikely to happen. Hope this answered your question.
Please do let us know if there's anything we can help! Hope you enjoy your Sesame!