How can I build muscle without going to the gym?

AstroZombie93
I can't go to the gym because I work at Wal Mart to support my injured mother so I have no time because of how busy my schedule us, but I was wondering since I have to do heavy lifting there; is there a way to build muscle without having to depend on the gym? I unload trucks and some of the stuff is very tiring and most of the guys thereare built pretty well there. I'm a bit thin so i just want to bulk up a little to make the lifting easier for me.
How can I build muscle without going to the gym?
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