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PHP Sorting value from array


I tried to practice creating a function for displaying array from csv file. I already list them as well, but can not sorting it from a to z by product name.

My functions:

  public function get_products() {
    return array_keys( $this->data );

And display

                                        <select name="product-name">
                                            <option value="none">Select your product</option>
                                                foreach ( $data->get_products() as $product )
                                                    echo '<option value="' . esc_attr( $product ) . '">' . $product . '</option>';

I tried these methods.

  public function get_products() {
    return array_keys( $this->data );
    return sort( $this->data );

var_dump return TRUE, but not a list array as array_keys.

A second question, on 'public function', is this mandatory to use 'return' on each row?