Basically, with any stuck control you end up using "secondary effects of controls".
Most people may not have done this since they did their flight training.
If you cannot free the jam (stuck) control, you would go through a series of control checks. ie use the controls that are not stuck to check the secondary effects of these controls on the aircraft itself. You can then test the landing confirguration.
A bit harder in larger aircraft, but in a training aircraft (R22, H300, B47), practicing a stuck cyclic you can try to change the C of G by learning forwards or backwards and by learning sideways etc. It takes time but you can get some movement and thus some attitude change.