In Jainism, the concept of "lock and key" is often referred to in the context of the Samayik Sutra or related Prakrit sutras which discuss mental restraint and the locking (bandhan) and unlocking (mukti) of karmic bondage.

However, in Gujarati Jain tradition, the phrase "lock and key" is sometimes used metaphorically in discourses to explain how right conduct (samvar) acts as a lock that prevents new karma from entering, and right knowledge (samyak jnana) acts as a key to open the lock and liberate the soul.

There is no specific sutra in the Jain Agamas or standard Gujarati Jain prayers literally titled "Lock and Key." If you are referring to a specific Jain sutra that mentions this analogy in Gujarati, it may be a part of an explanatory commentary or pravachan (discourse), not a canonical sutra.

If you can clarify which particular sutra or prayer you are referring to, I can help further! Otherwise, here is a relevant phrase in Gujarati:

બંધ — બંધન (Lock) = સમ્વર કુળી — કી (Key) = નિર્જરા

In summary:

• Samvar (સમ્વર) is like a lock (it stops new karmas from binding).
• Nirjara (નિર્જરા) is like a key (it removes existing karmas).

If you want the text of Samayik Sutra or any other Jain sutra in Gujarati, please specify which one.