Picking Non-duplicate Random Numbers using JavaScript

How would I pick 5 random lottery numbers without having duplicate numbers? The code below is what I have so far and I just can't figure out where to insert the code to loop through to pick out duplicate numbers and reassign new numbers? I've tried adding if and else along with forEach function but it didn't work. This is the code I have so far. Thank you in advance.

let lotto = [];
    for(let i = 0; i < 5; i++){
      lotto[i] = Math.floor(Math.random() * 69) + 1;
    }

const sorting = lotto.sort((a,b) => a - b);
    console.log(sorting);