Basic Trope: The elevator takes too long, so the character takes the stairs instead.
Straight: On the run from General Drake, Bob pushes the button for the elevator, but when Drake catches up, he takes the stairs instead.
Exaggerated: The elevator takes 3 hours to go up one floor.
Downplayed: Bob waits one second for the elevator before taking the stairs down one floor.
Drake was seconds away from catching up to Bob, so he had no time to wait.
The elevator was out of order.
Which floor the elevator is located at is displayed at the doors - Bob may have seen that all the elevators are too far away from her floor. Alternatively, there may be other people in the building chasing him - taking the elevator would mean Drake can tell his accomplices what floor Bob's at (especially if there's a chance one of them has access to a fire alarm, which would disable all elevators where they are and leave Bob a sitting duck).
Inverted: Bob starts to take the stairs, but ends up taking the elevator instead.
Subverted: Drake is just about to catch up to Bob when the elevator door opens.
Double Subverted: But the elevator is full, so he ends up taking the stairs.
Parodied: The elevator door opens seconds after Bob leaves to take the stairs.
Zig Zagged: Bob switches back and forth between stairs and the elevator.
Averted: The elevator door instantly opens, giving Bob no problem.
Enforced: The cameras are already set up in the stairwell, and the director thinks a chase down them will be more dramatic.
Lampshaded: "These elevators are so slow! I could be at the bottom by the time this thing gets up here!"
Exploited: Drake's accomplices are waiting for Bob in the stairway.
Defied: Bob refuses to take the stairs and fights off Drake while waiting for the elevator.
Conversed: "Isn't it funny how elevators take the longest when characters need it the most?"
Deconstructed: In a rush to escape from Drake, Bob trips up.