It is helpful to know before starting work that a galvanized sheet door can be affected by significant temperature differences, contractions, and expansions that can often de-center the system, while when unlocking the door of a metal door, you must take into account the possible condensation from inside, which can grind the components. When unlocking a car door , all the listed must be applied with even greater seriousness because an apartment door can be changed if something doesn't come out ideally the first time, but a car door, not so much. The locksmith near me will know all that.