Why does my dog do this sometimes?

It isn't a big deal at all, but sometimes my dog doesn't wanna leave the room she's in. She will just stand at the exit as if there's some wall blocking her. We have to get some dog food and just lure her out. Even when we're doing that it takes a while for her to leave. When she finally decides to leave the room, she walks really quickly.

It just happened a few minutes ago. The last time it happened was about 6 months ago, and she's been doing it a lot since then. Like I said, it's no big deal. It's just kinda weird. She's an 8 year old husky/hound.