I've been having weird issues with setAutoLockDisabled() but I THINK it may come down to a simple documentation error*. The docs say auto-lock happens in 60 seconds... but it seems to actually be 180 seconds?
(* Coupled with my Playdate refusing to auto-lock at all for the first week... until I did a quick Restart which fixed that!)
Just ran into the same issue, looks like the timeout has indeed increased to 3 minutes:
Just the docs being out of date 
Bumping because the discrepancy still seems to be there on the latest version of the Inside docs (v2.1.1). Inside Playdate I've confirmed the auto-lock timer within the OS itself to be 180 seconds.
Filed it, hopefully we won't forget to update it this time. Thanks!