I also find it hard to workout in the evenings. Once I'm home, I'm exhausted and getting me to walk is tough. I need to up it to lose weight, I lost some weight with my current plan which is nice. My schedule that seems to fit me:
1. Log everything I eat - This seems to really help because before I didn't think I snacked as much but all those snack add up.
2. Fit a 15 minute walk between work breaks, once in the morning and once in the afternoon. It helps me clear my head to continue to work again. Fortunately my work has a nice walking trail outside and a walking track inside. At first was just me but I got a friend and then other ladies were like "ooh I need to join ya'll" but really I just go with a friend or by myself.
3. Go home, continue to log my meals.
4. Pass out or maybe fit in another walk if I really want to be all fitness cool but usually fail at that.

That has helped me, I realized just moving a little bit where it adds up helped me. Also eating just 80% of my plate. It's hard to do that because I was really trained to eat it all with refugee parents.

Before I tried:
Wake up at 5AM and walk/run
Be glad that was over and still log my food for the day.

But that didn't stick long cause I hate waking up. And night time, well that's the night time exhaustion again.

If I were to be more serious about fitness, I'd probably do the mornings. It's nice to get it out the way first thing. It's not fast by any means, my method, but it's a routine I can get to stick. I lost 10lbs over 6 months doing this method and it was more like cut out my snacking and replace with walking. Weekends I walk the malls or a park. I bought a fitbit to sync with myfitnesspal. It keeps me on goal. Though last two weeks I was bad and forgot to charge it so I'm starting over and see if I can lose another 10lbs. My fitbit isn't fancy, but it keeps me on track.