It's rude not to hold the door for other people.
Jim is walking towards the bank with a man on crutches walking behind him.
Jim wants to enter the bank.
Jim opens the door, steps aside for the man on crutches to enter, then walks inside the bank.
Jim opens the door and walks inside the bank.
The man on crutches is able to easily enter the bank.
The man on crutches behind Jim struggles to open the door.