They locked my car in the repairs and left me with no car

Took in my car in for an oil leak. I approved the quote and they said it should be done by 12. At half 12 I decided to call them because they hadn’t called me that the car was ready and this is what they usually do when I take my car there for service. They left and I don’t have my car. They locked it in their shop and will be back on Monday. I don’t have my house keys and have to be at work on Monday morning. So basically my car is ****** because they did not inform me whether it was done and that I should pick it up. Im so shocked because what is this??!! Since when they don’t call clients when a car is ready.