Rust error when using sort with seq::index::sample

So I was trying to generate a sample of 5 numbers with:

use rand::{thread_rng, seq};
use std::time::SystemTime;

fn main(){
    let mut rng = thread_rng();

    let mut sample = seq::index::sample(&mut rng, 50, 5);
}

But when I try to sort it with:

sample.sort();

It gives me the following error:

error[E0599]: no method named sort found for type rand::seq::index::IndexVec in the current scope --> src/main.rs:12:16

How can I sort a random sample of numbers?

Bonus question: Is there a way to sample in a certain vector of elements? For example choose 3 numbers in [1,2,4,6,7,11,22,33]?