Combos are tricky things, so don't usually thing in combos, but do read things together. There are several cards that come to mind that read together could mean imprisonment.
Justice for one, for obvious reasons.
The Emperor for enforcement of laws and keeping things in order, including confinement.
Hanged Man, since it is about the consequences, surrender to higher authority and paying the price of your actions.
4 Pentacles... locked up
5 Swords... loss of freedom, no win, dishonorable action
6 & 9 Pentacles... it's sort of a "reap what you sow", you earned this, confined sort of card.
6 Wands is a real stretch of the imagination, but after all those skirmishes, you finally get to go to the Big House, and be the new kid on the block.
If you can't be a good example -
- then you will just have to be a horrible warning