This job requires you to locate a bank robbery and steal the gold from the vault. Remember that every time you start this job, the banks will be chosen randomly.
So first, you need to access the Terrorbyte's computer and check out the street cameras. Switch between the cameras to identify the bank that's being robbed. You will see police cars on the outside, so you will know in this way which of the banks is getting robbed.
Then, take any transport and go to the location. Enter the building and steal the gold from the vault. Lastly, return the gold to the specified location given to you by Lester on your phone.