What to do if the door is slammed shut or the key is lost?
First check whether a spare key is with neighbors or a window is open. If not, contact a reputable locksmith and clarify the total price in advance, including travel and any possible surcharges.
Avoid emergency numbers from stickers in the building entrance or expensive 0900 numbers. Ask on the phone for a binding total price, a realistic arrival time, and an invoice with full company details.