So this isn't true, but it can be a killing mix-up if you're playing in the lower level play.
Sonic at 22% (probably works a little bit more leniently, but I'm too lazy to test it). Down throw into up smash (no need to jump cancel), into short hop fair. Now, this relies on them not knowing how to tech, and they will have to basically not want to do anything since they can airdodge or contest with a fast attack. But from here - against really bad players - they will bounce on the ground if they really don't react. If they hit the bounce animation you can use jab one to lock them. From then you can do anything, but the best option against bad players would be to SH Nair into another jab lock into an F-Smash.
Keep in mind that you can do something different after the Fair or jab locks if you think it won't hit, although I figure that the first Fair would be pretty unexpected and maybe catch someone off guard and miss at least the first tech.