The baffling brain teaser, shared on Instagram’s Threads, asks people to ‘crack the password’ of a lock using a few hints. How quickly can you unlock it?

Creating passwords that are resistant to being cracked is becoming increasingly crucial. These puzzles can show how logic can help make passwords harder to crack.

If your password was 6 digits (as is default now) and you had changed your password within the last few minutes, it could take up to 374 days to crack it. A 4-digit code would take over 3 days.

Imagine a number lock with a three-digit code, and you're given five clues to crack it open. First, one digit is in the correct spot. Second, one digit is right, but it's in the wrong place.

He speculates that, if users select a four-digit password for an online account or other web site, it's not a stretch to use the same number for their four-digit bank PIN codes.

It's not clear if the GrayKey can reach the fastest unlocking times outlined by Green, but even at slower unlocking speeds, it only takes days to get into an iPhone with a 6-digit passcode.