I have a travellers’ tip for reheating baked goods such as croissants (at home I’d use an AirFryer which replicates this).
Pop the pastry into a paper bag and blast the contents with a hot hair dryer for a minute or so.
I discovered and honed this technique in Tokyo where I would pick up half price or less baked goods the evening before in the food basement of a fancy department store and revived the goodies at around 7am next day.