I never callus mine. I trim my overgrown ones with a wide "^” shape (upside down 'V'). I stick them in a jar of water like yours and let it face the sun. Occasionally refill the water and rinse if necessary -- sprouts roots like crazy and even further sprouts. Fun fact: they thrive in water!!
During the fall-winter time usually it takes months to grow some poor roots on Sansevieria. And some types do this much slower than other in my expirience.
Actually right now I have one Kirkii leaf in water for 4 months, and still nothing.
I'd bet it's missing sunlight, those things thrive in direct sun.
Second guess is that it's overwatered... does that pot drain well the water? it should definitely not be sitting in water and I would not water it very often.
Ditto you're likely overwatering, which is making nutrients less available. Have you repotted it since you got it? If so, what kind of soil did you use? It needs soil with some organic matter but more perlite than typical potting soil so it drains well.
I'd pull it out of its pot and look at the roots. They should be whitish and firm, if they're brown and slimy they're rotten, and those need to be removed. I'd also stop watering for a long time. If it starts to get droopy or shriveled leaves you know it's thirsty again
Thank you. It's definitely not too much shade, it has always been on a south facing window. Maybe the soil is garbage. I'll check the roots for rotting as soon as I have good new succulent soil.
I would recommend getting new soil and don't be afraid of having a high quantity of perlite/vermiculite and gravel. You want soil that doesn't retain much moisture, so avoid too high of a quantity of rich fertilizers, peat and clay. I also recommend getting it into the sunniest location you have in your house. If you're in the northern hemisphere, W and S are your best bet, West giving the most UV and hours of light per day.
The new growth may die back slightly from these conditions but it's okay: the new growth is weak and it's likely that trying to maintain the new growth in these conditions will only stress out the plant over time. I say it's better to just let the old die away and let the more resilient, hardy growth take over.
Depending on the time of year and other factors they will also put out air roots and even without the air roots you can clone it straight into dirt during spring and summer.
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