Issues on saving data from CPT select metabox

I got the answer. Now I have the code

function fichasvtmbasicas_meta_box_callback( $post ) {
wp_nonce_field( 'fichasvtmbasicas_meta_box', 'fichasvtmbasicas_meta_box_nonce' );
$fichasvtmbasicas_geracao_field = get_post_meta( $post->ID, '_vtmbasica_geracao_value_key', true );

echo '<div class="unidadeelementotopovtm"><label for="fichasvtmbasicas_geracao_field" class="topodaficha_titles">';
_e( 'Geração:', 'fichasvtmbasicas_textdomain' );
echo '</label> ';
echo '<select id="fichasvtmbasicas_geracao_field" name="fichasvtmbasicas_geracao_field">';
echo '<option value="decima-quinta" ' . selected( $fichasvtmbasicas_geracao_field, 'decima-quinta' ) . '>15ª</option>';
echo '<option value="decima-quarta" ' . selected( $fichasvtmbasicas_geracao_field, 'decima-quarta' ) . '>14ª</option>';
echo '<option value="decima-terceira" ' . selected( $fichasvtmbasicas_geracao_field, 'decima-terceira' ) . '>13ª</option>';
echo '<option value="decima-segunda" ' . selected( $fichasvtmbasicas_geracao_field, 'decima-segunda' ) . '>12ª</option>';
echo '<option value="decima-primeira" ' . selected( $fichasvtmbasicas_geracao_field, 'decima-primeira' ) . '>11ª</option>';
echo '<option value="decima" ' . selected( $fichasvtmbasicas_geracao_field, 'decima' ) . '>10ª</option>';
echo '<option value="nona" ' . selected( $fichasvtmbasicas_geracao_field, 'nona' ) . '>9ª</option>';
echo '<option value="oitava" ' . selected( $fichasvtmbasicas_geracao_field, 'oitava' ) . '>8ª</option>';
echo '<select>';
echo '</div>';
}

Then

function fichasvtmbasicas_save_meta_box_data( $post_id ) {
if ( ! isset( $_POST['fichasvtmbasicas_meta_box_nonce'] ) ) {
    return;
}
if ( ! wp_verify_nonce( $_POST['fichasvtmbasicas_meta_box_nonce'], 'fichasvtmbasicas_meta_box' ) ) {
    return;
}
if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
    return;
}
if ( isset( $_POST['post_type'] ) && 'page' == $_POST['post_type'] ) {

    if ( ! current_user_can( 'edit_page', $post_id ) ) {
        return;
    }

} else {

    if ( ! current_user_can( 'edit_post', $post_id ) ) {
        return;
    }
}

if ( ! isset( $_POST['fichasvtmbasicas_geracao_field'] ) ) { //para Geração
    return;
}

$vtmbasica_geracao = sanitize_text_field( $_POST['fichasvtmbasicas_geracao_field'] ); //para Geração
update_post_meta( $post_id, '_vtmbasica_geracao_value_key', $vtmbasica_geracao ); //para Geração
}

add_action( 'save_post', 'fichasvtmbasicas_save_meta_box_data' );

And it’s solved now. It can be useful for someone.

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