Interact with the laptop labeled CRIME.NET in the Safehouse to select your heist.
Once inside, you will need to complete a few objectives before you can escape.

1. Find the Manager's Keycard. It can be found in most office spaces, and on balconys.

2. Open the security room and retrieve the Thermal Drill and Thermite from inside.
(You can optionally unlock Metal Jacket by finding all 3 fuses and returning them to the electrical box in the security room.)

3. Place the thermal drill in front of the gate behind the metal detectors. It will take some time, so try looting and collecting fuses, or start finding the code for the unlockable door.

How to find code: 3 of the lootable safes will have clipboards with different numbers on them. Locate the nearby colored lamp to determine the associated color with that number. Enter the code in the downstairs office nearby the vault lobby gate.

4.Once the drill finishes, enter the vault lobby and place the thermite above the vault in the left side room. Once the thermite finishes you will see a hole in the floor, drop into the vault and steal the cash.

5. Shortly after entering the vault, the vault doors will open. Fight off the zombies waiting for you on the other side, and make a break for it.
Run upstairs and make your way to the security room. Plant C4 on the wall to the left of the security room door.

6. When the C4 explodes, enter the hole in the wall and run to the escape van. Once you step near the escape van, the game will end.

Happy Heisting!