How to change the Auto-Lock time on my iPad?

I doubt that your iPad's Auto-Lock is currently two seconds - but more likely two minutes.

iPad auto-lock will be fixed at two minutes if you have enabled Low Power mode:

Settings > Battery > Low Power Mode - set to OFF

You might also check that Date & Time and TimeZone are also correctly set for your iPad - as these settings are known to cause various functional issues if incorrectly configured:

Settings > General > Date & Time

Other than selecting Never, 15 minutes is the longest period that you can select in settings.

Remember, the Auto-Lock period relates to inactivity. Every interaction with the iPad resets the inactivity period.