May not be exactly what you were looking for but I use this Chrome extension which allows alphabetical sorting - https://chrome.google.com/webstore/detail/ultimello-the-features-pa/hahbfgjfimnmogoinnenhheepfcphnmm?hl=en-US.
You can't do this within Trello, but there's a Butler Bot Automation tool that can help. Here's the board with a lot of examples: https://trello.com/b/2dLsEE9t/butler-for-trello
Add Butler to your board here: https://www.butlerfortrello.com/dashboard.html
Once added, create a new card in the "Butler" list with the following:
for each list, sort the list by title
Each list should now be sorted alphabetically once the script runs.
Let me know if you have any questions getting set up
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