How could i end a function in different places?

Let me explain better, I have a shop script that uses more than one currency. if the player has at least the required amount of one of the currencies, then the item is bought.

Ex. The item costs 5 burgers and 3 kittens, if I have 5 burgers OR 3 kittens, the transaction is made. is there a function in lua that lets you break out of a function?

if currency1.Value > num then
    --subtract item
else
    --break out of function
end