jQuery/javascript running functions synchronously

javascript.js

function fun1() {
    setTimeout(function() {
        console.log("fun1 after 5 s..");
    }, 5 * 1000);
    return this;
};

function fun2() {
    setTimeout(function() {
        console.log("fun2 after another 15 s..");
    }, 15 * 1000);
    return this;
};
window.fun1().fun2();

jquery.js

$(document).ready(function() {
    $.fn.fun1 = function() {
        setTimeout(function() {
            console.log("fun1 after 5 s..");
        }, 5 * 1000);
        return $(this);
    };
    $.fn.fun2 = function() {
        setTimeout(function() {
            console.log("fun2 after another 15 s..");
        }, 15 * 1000);
        return $(this);
    };
    $(document).fun1().fun2();
});