Western Union is one of the easiest direct ways. If you're willing to sell to a bigger company, you can sell it all at once rather than taking small payments from many people. To use western union, the company will take your gold and give you a MTCN which is something like a confirmation code along with the senders name and location. You'll take that confirmation number to any local WU agent such as a bank and they will hand you the cash!
If you're in Canada, interac is probably the fastest way to get a direct transfer into your bank.
If WU is unavailable in your area, BTC is always a safe method. Just be sure to use 2 factor on your bitcoin wallet.