Use a switch or selection element that has mappings for these times. Then you’ll need a rule that triggers when heatingBoost receives a command. The rule will:
Turn on your heating
Set a timer that’s equal to the number of minutes in your heatingBoost command
Turn off the heating when the timer expires
Note that there’s a bit of risk to this, because if your system reboots then the timer will be lost and your heating will never turn off. I personally avoid long timers to minimize the risk, but others are okay with it. I’d be more concerned with heat not turning off than a light not turning off.
Rather than boosting heat for an arbitrary period of time, I would recommend that you get a temperature sensor and set a target temperature for the room. You can find examples of rules that turn off heat when the target is reached, then turn it on again after the temperature has fallen a bit. It’s basically a do-it-yourself thermometer using openHAB.