Brake sticking on ?

Roadster rear brake didn't release in parking lot WTF ??? Had brakes checked at last service they said all good ..

Pads look a bit thin but wouldn't expect them to jam on!

Managed to free them and rode home without incident, looking for any suggestions?

I will have them checked again next week but won't be able to get in there until mid week and will need to ride tomorrow..

Remove the pads ,simple thing to do carefully push the brakes until the piston starts coming out pull back the seal(gently) and squirt some WD40 and repeat.
Hold on a Roadster =new bike =still under warranty if the dealer is close by let him do the work but as said be carefull until it is checked out.