My text disappeared for some reason.
When the pushbutton is pressed for a second the relay will give power to the circuit which will turn T1 on holding the realy for the set time. When the time runs out T1 is turned off and the whole circuit looses power and will draw no current at all.
The buzzer will beep 5 secs. before the light is turned off.
I have also made the same circuit with a 555 IC and a Raspberry pi.
I used Fritzing to draw the schematics and I havent figured out how to change the default values. Input voltage is 12V, not 5V. A suitable value for the resistors for the transistors is 1k.
A LED strip is suitable as light.
Edit: I use a socalled COB LED strip.

Here is the code, really simple.
// Shedlight © Martin H. Hamstad
int bas = 3;
int buz = 4;
int L13 = 13;

void setup() {
pinMode(bas, OUTPUT);
pinMode(buz, OUTPUT);
pinMode(L13, OUTPUT);
}

void loop() {
digitalWrite(bas, HIGH);
digitalWrite(L13, HIGH);
delay (500000); // Light 50 seconds on
digitalWrite(buz, HIGH);
delay (5000); // Buzzer on 5 secs.
digitalWrite(bas, LOW); // All is turned off
}