I've had jobs that had a good bit of physical labor in them. During those periods I persisted with the bike even though I often didn't feel like it. I had very good seasons. It's kind of taking it to another level. You have to get used to it. Start with just a bit of riding after work, and gradually increase it. Try to be consistent. You'll probably find that your legs are sore at work at first, but you'll either get used to that, or it will pass, depending on your age. You'll find that resuming your biking will energize you, not drain you. You'll also find that even though you felt tired when you started, once on the bike and warmed up, you're fine.