I try to get the longitude and latitude but got an error

I will return the long and lat so I can use the Google Map in Oxygen. What I try... it doesn't work and get errors. The code below I try to echo the values but got an illegal string offset 'latitude' etc.

<?php
$location = rwmb_meta( 'map_id', ['object_type' => 'setting'], 'contact' );

echo $location['latitude'];
echo $location['longitude'];
echo $location['zoom'];

$test = $location['latitude'].','.$location['longitude'];
echo $test;

?>