With the option of a single-handed lock, you can easily lock the bike with one hand. This option is specially designed for people who can use 1 arm or hand while cycling. In addition, this option is also convenient for people with balance problems. They can lock the bike with one hand and lean on something with the other hand.
It's possible to mount a backpedal brake on all the bicycles as referred to in this article. A backpedal brake has many advantages, it requires less strength and you keep your hands free to steer.