Infinite money and lockpicks exploit:

You can farm unlimited money and lockpicks in Chapter 12: "Return to Hall of Heroes Plaza". This is immediately after exiting the Hall of Heroes. Farming lockpicks will come in handy when going for all of the collectables as some collectables are behind locked doors that require lockpicks to open. The maxiumum amount of lockpicks you can carry is 30, which is more than enough to open all the locks from this point in the game onwards.

The money farming can be a big help on your 1999 Mode playthrough, as you get a random amount of money (anywhere between $10 and $40) everytime you possess this particular machine. You can use the money to first upgrade the weapons and Vigors you want, and after that, you can use the money to cover the $100 cost of your deaths. Farming the money does take some time, but if you farm this for an hour or two, you will have thousands of coins to have as back-up for when you die.

For the farming method, follow the steps below:
1) Possess the Dollar Bill vending machine on the left side, after leaving the Hall of Heroes.
2) Use the Sky-Line on the right-hand side until you come to a platform. There are some enemies on the platform. Jump down and pick up the lockpick. It's on a wooden plank under the stairs.
3) Return to the Hall of Heroes, refill your Salts with the Salt machine if needed (can be refilled unlimited times).
4) Go back outside and repeat what you did earlier. The machine can be possessed again and the lockpicks respawn.

If you kill the enemies in front of the Hall of Heroes, they won't respawn. So you can keep farming without having any trouble with them.