Considering safe-cracking as a profession? This might be just where you should start. Build your own mechanical safe from precut, wooden pieces. Master the mix of slow knob twists and careful listening to tumbler movements that will open the lock. Will you retrieve your items, or will you have to hire a locksmith?
Size of finished safe: 7.7" x 7.3" x 6.9", level: medium, time to assemble: 6-7 hours.