Most employees will not see much income from social capital. While there may be the occasional gift or inheritance, Social Security and defined benefit pensions only begin to pay monthly income after retirement. On the other hand, those of us with medical and/or disability conditions may see income from matching social or insurance programs prior to retirement.
First of all, let's face the facts. Working 9 to 6, you won't have any time during the day. If you choose to have a second job during the evening hours, you'd get burnt out very easily. Chances are that you might under-perform in both the jobs. I recommend having a side business rather than a second job. Some investment of money and time would be required at first. I have come up with a few options that would require less work from you but would be a decent second source of income.
You can uses tools such as Wordpress for your website platform. MailChimp to collect email addresses. Clickfunnels to create funnels and landing pages that are completely automated. Stripe to process payments. These are just a few tools I use but there are many more options for each part of your business. Find the ones that work for you and help you create systems. (Disclaimer: I was not paid to mention any of these companies).
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Real Estate Income – Since we moved up to Newport Beach, I started renting out my condo in San Diego. My monthly cash on cash return is $300(I charge $1,900 for rent and my total payments including mortgage, HOA, property tax and insurance are $1,600) but I also get back around $350 every month in principal and about a $150 tax savings per month. But even this income is inconsistent, since sometimes expenses will pop up like last month when I had to buy a new A/C for $3,000!
Who cares, especially when very conservatively, the ultimate passive income includes a six digit or more base lease, plus an estimated additional six digits or more for rate increases and another six digits for more for various smaller and one bigger technology increase at 25 years. All four (base, rate, smaller and mega technology increases) combined, certainly could yield much more depending upon inflation, rate increases and technology increases?

The Indian pharmaceutical industry has grown in recent years to become a major manufacturer of health care products to the world. India produced about 8% of the global pharmaceutical supply in 2011 by value, including over 60,000 generic brands of medicines.[174] The industry grew from $6 billion in 2005 to $36.7 billion in 2016, a compound annual growth rate (CAGR) of 17.46%. It is expected to grow at a CAGR of 15.92% to reach $55 billion in 2020. India is expected to become the sixth-largest pharmaceutical market in the world by 2020.[175] It is one of the fastest-growing industrial sub-sectors and a significant contributor of India's export earnings. The state of Gujarat has become a hub for the manufacture and export of pharmaceuticals and active pharmaceutical ingredients (APIs).[176]

A lot of people these days are moving towards the two job concept. Amongst the people i know who have applied this in their life; the primary reason is that the 9 to 5 job pays their bills, lets the fire burning in the kitchen, and the second job is where their passion lies. This is the passion, which might have been forgotten while growing up, or is not a viable primary income source.
Jump up ^ M. K. Kuriakose, History of Christianity in India: Source Materials, (Bangalore: United Theological College, 1982), pp. 10–12. Kuriakose gives a translation of the related but later copper plate grant to Iravi Kortan on pp. 14–15. For earlier translations, see S. G. Pothan, The Syrian Christians of Kerala, (Bombay: Asia Publishing House, 1963), pp. 102–105.
What I’m doing: I view passive income as funny money to keep myself sane during this long journey. I estimate 2-10 years to get to my goal depending on how active I am. The dollars created are just points one can accumulate. I’ve made passive income goals for each passive income type and check in at least once a year like I am now to make sure I’m on track. Passive income is also carefully managed to minimize tax liability. When you can build a buffer for a buffer, you are then free to take more risks.
Most of us think of investment income as just the cash flow we get from bank interest, bonds, share dividends and property rents, some of which comes via a super pension.  But a more complete view is to also consider how growing the value of your investments can add to your spending potential.  This total return approach generates income from both income and growth to optimise spending from your portfolio across all market cycles, aligning cheap and expensive investments to your goals.