^_^
Two astronauts go up to a satellite for repairs and upgrades. Once they are up, geostationary, ready to get closer to the satellite one of the two goes out for a spacewalk checking the tools.
When finished he returns to the lock and knocks on the door.
"Who's there? the other astronaut calls out.

why did the astronaut go for a space walk? to get to the other side!

well, they didn't have their space bikes so he had to walk

I'm trying to imagine a space bike

pedals run a generator that powers a little ion drive?

starwars style