Monday was a super heavy day due to extra volume coming in from a train derailment the previous week. Stop count was +20 over max, I knew in the AM it would be at least a 10.5 hour day. Fine, no problem, I will git 'er done and make some OT on a nice sunny day. I get to my first stop, stick my key in the lock...and the lock is siezed. Wont budge. Key no workie. I tried my spare key that I have stashed in the cab. Key no workie, bulkhead door wont open. I called in and asked the mechanic to come and drill the lock out during the 45 minutes I spend unloading my pup trailer at a bulk stop. He said no, the only solution would be to deliver out the back door all day or to drive back to the building and swap cars. Neither option was viable. I called the center, but the entire management team was out on car and there was no one there who could or would make a decision. So I made a decision. I went thru the back door, crawled over the bulk, and opened the BH door from the inside. I then took a DIAD stylus, broke it in half, and jammed it into the latch to disable the lock. I then took a bungee cord and hooked one end onto the BH door chain, and the other end onto the fire extinguisher bracket. The tension of the bungee cord served to keep the door pulled closed while driving, but allowed me to open the door simply by unhooking it and letting the cord dangle. When I took lunch or was away from the car for any length of time, I pulled the stylus out of the latch and allowed the door to lock in order to secure the vehicle. I could then enter from the back door and repeat the process once it was time to get back to work. Since the Telematics switch was not completely engaged, I knew I would show up on the report anyway. This pretty much gave me a "free pass" to leave the door open while busting off DR's in my residential areas. I would have been perfectly within my rights to play the "safety card" and sabotage the whole day by refusing to operate the vehicle or insisting on working out of the back door. This would have created a multitude of service failures on a day when the center was already maxed out. I chose instead to find a way to get the work done. Was I right or wrong to do this?