Lockpicking.
Lockpicking is among my oldest hobbies. You can find here both the easiest and hardest locks I've picked over the years.
Mad Minute:
Ten padlocks in one minute. This was a challenge. In practice I found that most of the time was spent putting the tools in the locks, so I allowed myself to begin the challenge with tension tools already placed
Wall of Shame:
Masterlock 141 DLF - 1/10
One of the most common padlocks used indoors, this lock is easy to rake, easy to zip, and even vulnerable to overlift attacks. Since it also has a distinctive appearance anyone with even beginner level experience can spot these in the wild and open them with a comb.
Walgreens Padlock - 1/10
Possibly the lowest quality lock on this list. Not only are they easy to rake, but several I bought use the same key!
Masterlock 500D - 3/10
Cheaply made warded lock. Avoids a 1/10 rating by requiring a different tool.
CVS Luggage Lock - 0/10
I do not consider this a lock. Lacking a shackle catch, it can be opened by simply pulling.